T89C51RD2-RDTIL datasheet(6/104 Pages) ATMEL

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T89C51RD2

4243G–8051–05/03

Table 2. Pin Description

Mnemonic

Pin Number

Type

Name and Function

DIL

LCC

VQFP 1.4

Ground: 0V reference

Vss1

Optional Ground: Contact the Sales Office for ground connection.

VCC

Power Supply: This is the power supply voltage for normal, idle and power-down

operation

P0.0-P0.7

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 must be polarized to VCC

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 verification during which P0 outputs the code bytes.

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. 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 TSC8x54/58 Port 1 include:

I/O

T2 (P1.0): Timer/Counter 2 external count input/Clockout

T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control

ECI (P1.2): External Clock for the PCA

I/O

CEX0 (P1.3): Capture/Compare External I/O for PCA module 0

I/O

CEX1 (P1.4): Capture/Compare External I/O for PCA module 1

I/O

CEX2 (P1.5): Capture/Compare External I/O for PCA module 2

I/O

CEX3 (P1.6): Capture/Compare External I/O for PCA module 3

I/O

CEX4 (P1.7): Capture/Compare External I/O for PCA module 4

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 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. Some Port 2 pins receive the high order

address bits during EPROM programming and verification:

P2.0 to P2.5 for RB devices

P2.0 to P2.6 for RC devices

P2.0 to P2.7 for RD devices.

P3.0-P3.7

10-17

11,

13-19

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 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

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