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FUJITSU MB91F109 FR30 User Manual

Page 113

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3.9 Gear Function

Figure 3.9-2 Clock Selection Timing Chart

Blocks That Use the Peripheral Clock

The blocks listed below use the peripheral clock, which can be set by the gear function, as the
operating clock.

Calculate the operation time based on the frequency division ratio set to bits PCK0 and PCK1 of
the GCR register of the clock generator.

Clock generator

Interrupt controller

Ports D to F

U-TIMER (channels 0, 1, 2)

UART (channels 0, 1, 2)

A/D converter

16-bit reload timer (channels 0, 1, 2)

External interrupt

NMI controller

Delayed interrupt module

PWM timer

CPU clock (a)

CPU clock (b)

CHC

CCK value

01

00

PCK value

00

Peripheral clock (a)

Peripheral clock (b)

Source clock