AT80C51RB2-3CSCM datasheet(4/83 Pages) ATMEL

4 / 83 page

AT80C51RD2/AT83C51Rx2

4113B–8051–03/05

Table 2. Pin Description

Mnemonic

Pin Number

Type

Name and Function

DIL

PLCC44

VQFP44 1.4

Ground: 0V reference

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, bi-directional 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 VSS 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 bi-directional 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 T89C51RB2/RC2 Port 1 include:

I/O

P1.0: Input/Output

I/O

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

I/O

P1.1: Input/Output

T2EX: Timer/Counter 2 Reload/Capture/Direction Control

I/O

P1.2: Input/Output

ECI: External Clock for the PCA

I/O

P1.3: Input/Output

I/O

CEX0: Capture/Compare External I/O for PCA module 0

I/O

P1.4: Input/Output

I/O

CEX1: Capture/Compare External I/O for PCA module 1

I/O

P1.5: Input/Output

I/O

CEX2: Capture/Compare External I/O for PCA module 2

I/O

P1.6: Input/Output

I/O

CEX3: Capture/Compare External I/O for PCA module 3

I/O

P1.7: Input/Output:

I/O

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

XTAL1

Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock

generator circuits.

XTAL2

Crystal 2: Output from the inverting oscillator amplifier

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