HD404354 データシートの表示（PDF） - Hitachi -> Renesas Electronics

部品番号

コンポーネント説明

メーカー

HD404354

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

HD404358 Series

Internal Oscillator Circuit

A block diagram of the clock generation circuit is shown in figure 17. As shown in table 20, a ceramic

oscillator or crystal oscillator can be connected to OSC1 and OSC2. The system oscillator can also be

operated by an external clock. See figure 18 for the layout of crystal and ceramic oscillator.

OSC2

OSC1

System fOSC 1/4 fcyc Timing

oscillator

division

circuit

tcyc

generator

circuit

øCPU

CPU with ROM,

RAM, registers,

flags, and I/O

øPER

Peripheral

function

interrupt

Figure 17 Clock Generation Circuit

TEST

RESET

OSC1

OSC2

GND

AVSS

Figure 18 Typical Layout of Crystal and Ceramic Oscillator

30

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