UPD78323 NEC, UPD78323 Datasheet - Page 31

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

3.5
Port Name
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.
Port 2
Port 0
Port 3
Port 4
Port 5
Port 7
Port 8
Port 9
PORT FUNCTIONS
8-bit input
8-bit input/outpput
5-bit input/output
8-bit input/output
8-bit input/output
8-bit input
6-bit input/output
4-bit input/output
Function
Input port pin. Functions as an external interrupt input.
Specifiable bit-wise for input/output.
Also specifiable for realtime output port.
Specifiable bit-wise for port pins or control pins.
Specifiable in 8-bit units for input or 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
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
A/D converter.
Specifiable bit-wise for the port pin or control pin.
Specifiable bit-wise for input/output.
P90 and P91 function as RD output and WR 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.
Table 3-1. Port Functions and Features
Feature
Serves as RTP0 to RTP7
and pins.
Serves as NMI, INTP0 to
INTP5, INTP6/TI and pins.
Serves as T
SO/SB0, SI/SB1, SCK and
pins.
Serves as AN0 to AN7
and pins.
Functions as TO00 to
TO03, TO10 to TO11 and
pins.
PD78323, 78324
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Remarks
X
D, R
X
D,
31