AT89C51ID2-RDTIM datasheet(13/159 Pages) ATMEL

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AT89C51ID2

4289A–8051–09/03

I/O

CEX4: Capture/Compare External I/O for PCA module 4

I/O

MOSI: SPI Master Output Slave Input line

When SPI is in master mode, MOSI outputs data to the slave peripheral.

When SPI is in slave mode, MOSI receives data from the master controller.

XTALA1

Crystal A 1: Input to the inverting oscillator amplifier and input to the inter-

nal clock generator circuits.

XTALA2

Crystal A 2: Output from the inverting oscillator amplifier

XTALB1

Crystal B 1: (Sub Clock) Input to the inverting oscillator amplifier and input

to the internal clock generator circuits.

XTALB2

Crystal B 2: (Sub Clock) Output from the inverting oscillator amplifier

P2.0 - P2.7

24 - 31

18 - 25

54, 55,

56, 58,

59, 61,

64, 65

43, 44,

45, 47,

48, 50,

53, 54

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 pulled

low will source current because of the internal pull-ups. 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 emitting 1s.

During accesses to external data memory that use 8-bit addresses (MOVX

@Ri), port 2 emits the contents of the P2 SFR.

P3.0 - P3.7

11,

13 - 19

7 - 13

34, 39,

40, 41,

42, 43,

45, 47

25, 28,

29, 30,

31, 32,

34, 36

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.

RXD (P3.0): Serial input port

TXD (P3.1): Serial output port

INT0 (P3.2): External interrupt 0

INT1 (P3.3): External interrupt 1

T0 (P3.4): Timer 0 external input

T1 (P3.5): Timer 1 external input

WR (P3.6): External data memory write strobe

RD (P3.7): External data memory read strobe

P4.0 - P4.7

20, 24,

26, 44,

46, 50,

53, 57

11, 15,

17,33,

35,39,

42, 46

I/O

Port 4: Port 4 is an 8-bit bidirectional I/O port with internal pull-ups. Port 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 pins that are externally pulled

low will source current because of the internal pull-ups.

P5.0 - P5.7

60, 62,

63, 7, 8,

10, 13,

49, 51,

52, 62,

63, 1, 4,

I/O

Port 5: Port 5 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 5 pins that are externally pulled

low will source current because of the internal pull-ups.

Table 14. Pin Description (Continued)

Mnemonic

Pin Number

Type

Name and Function

PLCC44

VQFP44

PLCC68

VQFP64

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