TMP88CS43FG datasheet(21/218 Pages) TOSHIBA

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Page 11

TMP88CS43FG

2.1.4 System Clock Control Circuit

The System Clock Control Circuit consists of a clock generator, timing generator, and standby control cir-

cuit.

Figure 2-2 System Clock Control Circuit

2.1.4.1 Clock Generator

The Clock Generator generates the fundamental clock which serves as the reference for the system

clocks supplied to the CPU core and peripheral hardware units.

The high-frequency clock (frequency fc) can be obtained easily by connecting a resonator to the XIN

and XOUT pins. Or a clock generated by an external oscillator can also be used. In this case, enter the

external clock from the XIN pin and leave the XOUT pin open. The TMP88CS43FG does not support the

CR network that produces a time constant.

Figure 2-3 Example for Connecting a Resonator

Adjusting the oscillation frequency

Note: Although no hardware functions are provided that allow the fundamental clock to be monitored directly

from the outside, the oscillation frequency can be adjusted by forwarding the pulse of a fixed frequency

(e.g., clock output) to a port and monitoring it in a program while interrupts and the watchdog timer are

disabled. For systems that require adjusting the oscillation frequency, an adjustment program must be

created beforehand.

2.1.4.2 Timing Generator

The Timing Generator generates various system clocks from the fundamental clock that are supplied to

the CPU core and peripheral hardware units. The Timing Generator has the following functions:

Timing generator

Standby control circuit

High-frequency

clock oscillator

circuit

TBTCR

SYSCR2

SYSCR1

XIN

XOUT

Clock

generator

00036H

00038H

00039H

System clocks

Timing generator control register

System control register

XIN

High-frequency Clock

XOUT

(a) Using a crystal or

ceramic resonator

XIN

XOUT

(b) Using an external

oscillator

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