D780232 データシートの表示（PDF） - NEC => Renesas Technology

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D780232

8-BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

SO3/P21

SCK3/P20

Figure 5-8. Serial Interface SIO3 Block Diagram

Internal bus

Serial shift register 3 (SIO3)

µPD780232

Serial

clock counter

Serial clock

controller

Interrupt request

signal generator

INTCSI3

fX/22 to fX/24

5.6 VFD Controller/Driver

A VFD controller/driver with the following functions is incorporated.

(a) Total number of display outputs: 53. Output of 16 patterns is enabled.

(b) 112-byte display RAM is provided to enable display signal output by reading display data automatically (direct

memory access (DMA)).

(c) A port pin that is not used for VFD display can be used as an output port or an I/O port (except for FIP0 to

FIP23, which are VFD output-only pins).

(d) The luminance can be adjusted in 8 levels using display mode register 1 (DSPM1).

(e) Hardware taking into consideration the key scan application is incorporated.

(f) Whether the key scan timing is inserted or not is selectable.

(g) A high-tolerance output buffer (VFD driver) that can drive the VFD directly is incorporated.

(h) VFD output pins can incorporate a pull-down resistor, set by a mask option.

Data Sheet U13415EJ2V0DS

19

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