CHAPTER 3 CPU AND CONTROL UNITS
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:
Built-in RAM and ROM
Bit search module
I-bus, D-bus, X-bus, and F-bus
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.