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AT89C51ID2
4289C–8051–11/05
Table 15. Pin Description
Mnemonic
Pin Number
Type
Name and Function
PLCC44
VQFP44
V
SS
22
16
I
Ground: 0V reference
V
CC
44
38
I
Power Supply: This is the power supply voltage for normal, idle and power-down opera-
tion
P0.0 - P0.7
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 must be polarized to V
CC or
V
SS in order to prevent any parasitic current consumption. Port 0 is also the multiplexed
low-order address and data bus during access to external program and data memory. In
this application, it uses strong internal pull-up when emitting 1s. Port 0 also inputs the code
bytes during EPROM programming. External pull-ups are required during program verifica-
tion during which P0 outputs the code bytes.
P1.0 - P1.7
2 - 9
40 - 44
1 - 3
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 AT89C51ID2 Port 1 include:
2
40
I/O
P1.0: Input/Output
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
I
XTALB1 (P1.0): Sub Clock input to the inverting oscillator amplifier
3
41
I/O
P1.1: Input/Output
I
T2EX: Timer/Counter 2 Reload/Capture/Direction Control
I
SS: SPI Slave Select
4
42
I/O
P1.2: Input/Output
I
ECI: External Clock for the PCA
5
43
I/O
P1.3: Input/Output
I/O
CEX0: Capture/Compare External I/O for PCA module 0
6
44
I/O
P1.4: Input/Output
I/O
CEX1: Capture/Compare External I/O for PCA module 1
7
1
I/O
P1.5: Input/Output
I/O
CEX2: Capture/Compare External I/O for PCA module 2
I/O
MISO: SPI Master Input Slave Output line
When SPI is in master mode, MISO receives data from the slave peripheral. When SPI is in
slave mode, MISO outputs data to the master controller.
8
2
I/O
P1.6: Input/Output
I/O
CEX3: Capture/Compare External I/O for PCA module 3
I/O
SCK: SPI Serial Clock
9
3
I/O
P1.7: Input/Output:
I/O
CEX4: Capture/Compare External I/O for PCA module 4
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