UPD754144 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD754144

4-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD754144, 754244

7. PERIPHERAL HARDWARE FUNCTIONS

7.1 Digital Input/Output Ports

The following two types of I/O ports are provided.

• CMOS input (Port 7)

• CMOS I/O (Ports 3, 6, 8)

Total

:4

:9

: 13

Table 7-1. Types and Features of Digital Ports

Port Name

PORT3

PORT6

PORT7

PORT8

Function

4-bit I/O

4-bit input

1-bit I/O

Operation and Features

Remarks

Can be set to input or output mode bit-wise.

Also used as PTO0 to PTO2 pins.

Also used as AVREF, INT0, PTH00,

and PTH01 pins.

4-bit input only port

Also used as KR4 to KR7 pins.

On-chip pull-up resistor connection can be specified

by mask option bit-wise.

Can be set to input or output mode bit wise.

_

7.2 Clock Generator

The clock generator provides the clock signals to the CPU and peripheral hardware. Its configuration is shown

in Figures 7-1 and 7-2.

The operation of the clock generator is set with the processor clock control register (PCC).

The instruction execution time can be changed.

• µPD754144

• 4, 8, 16, 64 µs (when the system clock fCC operates at 1.0 MHz)

• µPD754244

• 0.95, 1.91, 3.81, 15.3 µs (when the system clock fX operates at 4.19 MHz)

• 0.67, 1.33, 2.67, 10.7 µs (when the system clock fX operates at 6.0 MHz)

19

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