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80C152JC-1 Datasheet(PDF) 6 Page - Intel Corporation

Part # 80C152JC-1
Description  UNIVERSAL COMMUNICATION CONTROLLER 8-BIT MICROCONTROLLER
Download  17 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

80C152JC-1 Datasheet(HTML) 6 Page - Intel Corporation

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8XC152JAJBJCJD
Pin Description
(Continued)
Pin
Pin Description
47-40
65-58
Port 4
Port 4 is an 8-bit bidirectional IO port with internal pullups Port 4 pins that
have 1s written to them are pulled high by the internal pullups and in that state can
be used as inputs As inputs Port 4 pins that are externally being pulled low will
source current (IIL on the data sheet) because of the internal pullups In addition
Port 4 also receives the low-order address bytes during program verification
913
RST
Reset input A logic low on this pin for three machine cycles while the
oscillator is running resets the device An internal pullup resistor permits a power-on
reset to be generated using only an external capacitor to VSS Although the GSC
recognizes the reset after three machine cycles data may continue to be
transmitted for up to 4 machine cycles after Reset is first applied
38
55
ALE
Address Latch Enable output signal for latching the low byte of the address
during accesses to external memory
In normal operation ALE is emitted at a constant rate of
the oscillator
frequency and may be used for external timing or clocking purposes Note
however that one ALE pulse is skipped during each access to external Data
Memory While in Reset ALE remains at a constant high level
37
54
PSEN
Program Store Enable is the Read strobe to External Program Memory
When the 8XC152 is executing from external program memory PSEN is active
(low) When the device is executing code from External Program Memory PSEN is
activated twice each machine cycle except that two PSEN activations are skipped
during each access to External Data Memory While in Reset PSEN remains at a
constant high level
39
56
EA
External Access enable EA must be externally pulled low in order to enable
the 8XC152 to fetch code from External Program Memory locations 0000H to
0FFFH
EA must be connected to VCC for internal program execution
23
32
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock
generating circuits
22
31
XTAL2
Output from the inverting oscillator amplifier
NA
17 20
Port 5
Port 5 is an 8-bit bidirectional IO port with internal pullups Port 5 pins that
21 22
have 1s written to them are pulled high by the internal pullups and in that state can
38 39
be used as inputs As inputs Port 5 pins that are externally being pulled low will
40 49
source current (IIL on the data sheet) because of the internal pullups
Port 5 is also the multiplexed low-order address and data bus during accesses to
external program memory if EBEN is pulled high In this application it uses strong
pullups when emitting 1s
NA
67 66
Port 6
Port 6 is an 8-bit bidirectional IO port with internal pullups Port 6 pins that
52 57
have 1s written to them are pulled high by the internal pullups and in that state can
50 68
be used as inputs As inputs Port 6 pins that are externally pulled low will source
1 51
current (IIL on the data sheet) because of the internal pullups
Port 6 emits the high-order address byte during fetches from external Program
Memory if EBEN is pulled high In this application it uses strong pullups when
emitting 1s
NA
12
EBEN
E-Bus Enable input that designates whether program memory fetches take
place via Ports 0 and 2 or Ports 5 and 6 Table 1 shows how the ports are used in
conjunction with EBEN
NA
53
EPSEN
E-bus Program Store Enable is the Read strobe to external program
memory when EBEN is high Table 2 shows when EPSEN is used relative to PSEN
depending on the status of EBEN and EA
6


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