Clock Distribution - Fujitsu FR60 Hardware Manual

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CHAPTER 3 CPU AND CONTROL UNITS

Clock Distribution

An operating clock for each function is generated based on the base clock generated

from the source clock. A total of three internal operating clocks are provided. A divide-

by rate can be set independently for each of them.

This section describes these internal operating clocks.

■ CPU Clock (CLKB)

This clock is used for the CPU, internal memory, and internal buses.

It is used by the following circuits:

Instruction cache

Built-in RAM and ROM

Bit search module

I-bus, D-bus, X-bus, and F-bus

DMA controller

Since 50 MHz is the upper-limit frequency for operation, do not set a combination of multiply-by rate and

divide-by rate that results in a frequency exceeding this limit.

Mb91350a series