UPD78323LP datasheet(31/86 Pages) NEC

31 / 86 page

µPD78323, 78324

3.5

PORT FUNCTIONS

Table 3-1 lists the digital input/output ports.

Each port can carry out many control operations including 8 and other bit data input/output operations.

Table 3-1. Port Functions and Features

Port Name

Function

Feature

Remarks

Specifiable bit-wise for input/output.

Serves as RTP0 to RTP7

Also specifiable for realtime output port.

and pins.

Serves as NMI, INTP0 to

INTP5, INTP6/TI and pins.

Serves as TXD, RXD,

Port 3

5-bit input/output

Specifiable bit-wise for port pins or control pins.

SO/SB0, SI/SB1, SCK and

pins.

Specifiable in 8-bit units for input or output.

Port 4

8-bit input/output

Functions as the multiplexed address/data bus (AD0 to

––––––––

AD7) in the external memory expansion mode.

Specifiable bit-wise for input or output.

Functions as the address bus (A8 to A15) in the external

Port 5

8-bit input/output

memory expansion mode.

––––––––

Pins which are not used as the address bus can be used

as a port.

Input port pin. Also functions as analog input to the

Serves as AN0 to AN7

A/D converter.

and pins.

Functions as TO00 to

Port 8

6-bit input/output

Specifiable bit-wise for the port pin or control pin.

TO03, TO10 to TO11 and

pins.

Specifiable bit-wise for input/output.

P90 and P91 function as RD output and WR output,

Port 9

4-bit input/output

respectively, in the external memory expansion mode.

––––––––

P92 and P93 function as TAS output and TMD output,

respectively, in the high-speed fetch mode.

Port 2

8-bit input

Input port pin. Functions as an external interrupt input.

Port 7

8-bit input

Port 0

8-bit input/outpput

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