UPD750004A datasheet(21/84 Pages) NEC

21 / 84 page

µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)

When the serial interface function is used, dual-function pins

function as output pins in some operation modes.

4-bit input port

Allows input or output mode setting in units of 4 bits.

Allows input or output mode setting in units of 1 bit.

Operation and feature

Port name

PORT0

PORT1

PORT2

PORT3

PORT4

PORT5

PORT6

PORT7

PORT8

6. PERIPHERAL HARDWARE FUNCTIONS

6.1

DIGITAL I/O PORTS

The

µPD750008 has the following three types of I/O port:

• 8 CMOS input pins (PORT0 and PORT1)

• 18 CMOS I/O pins (PORT2, PORT3, and PORT6 to PORT8)

• 8 N-ch open-drain I/O pins (PORT4 and PORT5)

Total: 34 pins

Table 6-1 Digital Ports and Their Features

6.2

CLOCK GENERATOR

The clock generator generates clocks which are supplied to the peripheral hardware in the CPU. Fig. 6-1 shows

the configuration of the clock generator.

Operation of the clock generator is specified by the processor clock control register (PCC) and system clock control

The main system clock and subsystem clock are used.

The instruction execution time can be made variable.

• 0.95

µs, 1.91 µs, 3.81 µs, 15.3 µs (when the main system clock is at 4.19 MHz)

• 0.67

µs, 1.33 µs, 2.67 µs, 10.7 µs (when the main system clock is at 6.0 MHz)

• 122

µs (when the subsystem clock is at 32.768 kHz)

Allows input or output mode setting in

units of 4 bits. Whether to use pull-up

resistors can be specified bit by bit with

the mask option.

Allows input or output mode setting in

units of 1 bit.

Allows input or output mode setting in

units of 4 bits.

Ports 4 and 5 can be

paired, allowing data

I/O in units of 8 bits.

Ports 6 and 7 can be

paired, allowing data

I/O in units of 8 bits.

4-bit input

4-bit I/O

4-bit I/O (N-ch

open-drain can

withstand 13 V)

4-bit I/O

2-bit I/O

Also used as INT4, SCK,

SO/SB0, or SI/SB1.

Also used as INT0, INTI,

INT2 or TI0.

Also used as PTO0,

PTO1, PCL, or BUZ.

Also used as one of KR0

to KR3.

Also used as one of KR4

to KR7.

Allows input or output mode setting in units of 2 bits.

Function

Remarks

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