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DESCRIPTION

7721 Group User’s Manual

1–6

1.3 Pin description

Table 1.3.3 Pin description (3)

P43–P47

P50–P57

P60–P67

P70–P77

P80–P87

P90–P97

P100–

P107

Functions

Port P4 is a 5-bit CMOS I/O port. This port has an

I/O direction register and each pin can be programmed

for input or output.

Port P5 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as I/O pins for

Timers A2–A4 and I/O pins for Timers B0, B1.

Port P6 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as output pins for

the real-time output.

Port P7 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as input pins for

A-D converter.

Port P8 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as I/O pins for

Serial I/O.

Port P9 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as I/O pins for

DMA controller.

Port P10 is an 8-bit I/O port with the same function as

P4. These pins can be programmed as I/O pin for TC

and output pins for DRAM controller.

___

P100–P102 also function as input pins for INT0–INT2.

Name

I/O port P4

I/O port P5

I/O port P6

I/O port P7

I/O port P8

I/O port P9

I/O port P10

Input/Output

I/O

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