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T83C5101 Datasheet(PDF) 5 Page - ATMEL Corporation

Part # T83C5101
Description  8-bit Low Pin Count Microcontrollers
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T83C5101 Datasheet(HTML) 5 Page - ATMEL Corporation

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5
T8xC5101/02
4233H–8051–02/08
T8xC5101/02 Pin Configuration
Mnemonic
Pin Number
Type
Name and Function
24 pins
28
pins
VSS
12
14
I
Ground: 0V reference
VCC
24
28
I
Power Supply: This is the power supply voltage for normal, idle and power-down operation
P1.0-P1.7
13-20
15-20
22-23
I/O
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. 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. Port 1
also receives the low-order address byte during memory programming and verification.
Alternate functions for Port 1 include:
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
I
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
P4.0 (Prog)-P4.1
(Test)
7
8
8
9
O (I)
O (I)
Port 4 bits 0 & 1: Except during programming and verifying, these two bits are output port driving
30 micro Amps at high level and sinking 10 mA at low level (Vol < 1V). If they have 1s written to
them, they output a high level and if they have 0 written to them, they output a low level. These 2
pins cannot be used as inputs. Users should take care to never externally drive these pins
low, especially during reset. These two pins are primarily designed to drive LEDs.
During programming and verifying, these two pins are used as input, as explained in the
corresponding chapter.
A Read or a Read/Modify/Write instruction to these bits will read the status of the output: 1 if the
output is 1, 0 if the output is 0.
P4.2-P4.5
NA
27
7
13
21
I/O
Port 4 bits 2 to 5: bidirectional I/O port with internal pull-ups. Port 4.2 to 4.5 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port
4.2 to 4.5 pins that are externally pulled low will source current because of the internal pull-ups.
P3.0-P3.7
5-1
23-21
5-1
26-24
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 pulled low will source current because of the internal pull-ups. Port 3
also serves the special features of the 80C51 family, as listed below.
5
5
I
RxD (P3.0): Serial input port
4
4
O
TxD (P3.1): Serial output port
3
3
I
INT0 (P3.2): External interrupt 0
2
2
I
INT1 (P3.3): External interrupt 1
P4.1/Test
P3.0
RST
XTAL2
XTAL1
P3.1
1
VPP
P4.0/Prog
Vss
P1.6
P1.4
P1.5
P1.3
P1.1/T2EX
P1.0/T2
P1.2
P3.4/T0
P3.2/INT0
P3.3/INT1
Vcc
P3.5/T1
P3.6
P3.7
P1.7
DIL24
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
SSOP24*
* Check for availability
SO24
P4.1/Test
P3.0
RST
XTAL2
XTAL1
P3.1
1
VPP
P4.0/Prog
Vss
P1.6
P1.4
P1.5
P1.3
P1.1/T2EX
P1.0/T2
P1.2
P3.4/T0
P3.2/INT0
P3.3/INT1
Vcc
P3.5/T1
P3.6
P3.7
P1.7
2
3
4
5
6
8
9
10
11
12
13
28
27
26
25
24
23
21
20
19
18
17
16
* Check for availability
SO28*
P4.3
7
P4.4
14
15
P4.5
P4.2
22


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