Electronic Components Datasheet Search
Selected language     English  ▼
Part Name
         Description


87C54 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. 87C54
Description  CMOS single-chip 8-bit microcontrollers
Download  21 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

 6 page
background image
Philips Semiconductors
Preliminary specification
87C54/87C58
CMOS single-chip 8-bit microcontrollers
1996 Aug 16
3-220
PIN DESCRIPTIONS
PIN NUMBER
MNEMONIC
DIP
LCC
QFP
TYPE
NAME AND FUNCTION
VSS
20
22
16
I
Ground: 0V reference.
VCC
40
44
38
I
Power Supply: This is the power supply voltage for normal, idle, and power-down operation.
P0.0–0.7
39–32
43–36
37–30
I/O
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to them
float and can be used as high-impedance inputs. Port 0 is also the multiplexed low-order
address and data bus during accesses to external program and data memory. In this
application, it uses strong internal pull-ups when emitting 1s. Port 0 also outputs the code
bytes during program verification and receives code bytes during EPROM programming.
External pull-ups are required during program verification.
P1.0–P1.7
1–8
2–9
40–44,
1–3
I/O
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups, except P1.6 and P1.7
which are open drain. Port 1 pins that have 1s written to them are pulled high by the internal
pull-ups and can be used as inputs. As inputs, port 1 pins that are externally pulled low will
source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL).
Port 1 also receives the low-order address byte during program memory verification.
Alternate functions include:
1
2
40
I
T2 (P1.0): Timer/Counter 2 external count input/Clockout
2
3
41
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
P2.0–P2.7
21–28
24–31
18–25
I/O
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
port 2 pins that are externally being pulled low will source current because of the internal
pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte
during fetches from external program memory and during accesses to external data memory
that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pull-ups
when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOV
@Ri), port 2 emits the contents of the P2 special function register. Some Port 2 pins receive
the high order address bits during EPROM programming and verification.
P3.0–P3.7
10–17
11,
13–19
5,
7–13
I/O
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
port 3 pins that are externally being pulled low will source current because of the pull-ups.
(See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the 80C51
family, as listed below:
10
11
5
I
RxD (P3.0): Serial input port
11
13
7
O
TxD (P3.1): Serial output port
12
14
8
I
INT0 (P3.2): External interrupt
13
15
9
I
INT1 (P3.3): External interrupt
14
16
10
I
T0 (P3.4): Timer 0 external input
15
17
11
I
T1 (P3.5): Timer 1 external input
16
18
12
O
WR (P3.6): External data memory write strobe
17
19
13
O
RD (P3.7): External data memory read strobe
RST
9
10
4
I
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the
device. An internal diffused resistor to VSS permits a power-on reset using only an external
capacitor to VCC.
ALE/PROG
30
33
27
I/O
Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the
address during an access to external memory. In normal operation, ALE is emitted at a
constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking.
Note that one ALE pulse is skipped during each access to external data memory. This pin is
also the program pulse input (PROG) during EPROM programming. ALE can be disabled by
setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction.
PSEN
29
32
26
O
Program Store Enable: The read strobe to external program memory. When the 8XC58 is
executing code from the external program memory, PSEN is activated twice each machine
cycle, except that two PSEN activations are skipped during each access to external data
memory. PSEN is not activated during fetches from internal program memory.
EA/VPP
31
35
29
I
External Access Enable/Programming Supply Voltage: EA must be externally held low to
enable the device to fetch code from external program memory locations 0000H and 7FFFH.
If EA is held high, the device executes from internal program memory unless the program
counter contains an address greater than 7FFFH. This pin also receives the 12.75V
programming supply voltage (VPP) during EPROM programming. If security bit 1 is
programmed, EA will be internally latched on Reset.
XTAL1
19
21
15
I
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
XTAL2
18
20
14
O
Crystal 2: Output from the inverting oscillator amplifier.
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin at any time must not be higher than VCC + 0.5V or VSS – 0.5V, respectively.




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
M37151SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER 1 2 3 4 5 MoreRenesas Technology Corp
P87LPC778CMOS single-chip 8-bit 80C51 microcontroller 128-byte data RAM 8 kB OTP 1 2 3 4 5 MoreNXP Semiconductors
M37544SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 1 2 3 4 5 MoreRenesas Technology Corp
TMP87PM29UCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
PCF85116-32048 x 8-bit CMOS EEPROM with I2C-bus interface 1 2 3 4 5 MoreNXP Semiconductors
HD404202CMOS 4-bit Single-Chip Microcomputers with the same architecture as the HMCS400 Series 1 2 3 4 5 MoreHitachi Semiconductor
PIC16LV5XEPROM-Based 8-Bit CMOS Microcontroller Series 1 2 3 4 5 MoreMicrochip Technology
HM628128LP131072-word x 8-bit High Speed CMOS Static RAM 1 2 3 4 5 MoreHitachi Semiconductor
TMP87P809NCMOS 8-bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor
TMP87PH47UCMOS 8-Bit Microcontroller 1 2 3 4 5 MoreToshiba Semiconductor

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl