TMP93CS32F datasheet(15/180 Pages) TOSHIBA

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TMP93CS32

2004-02-10

93CS32-13

3.3.1

System Clock Controller

The system clock controller generates system clock (fSYS) for CPU core and internal I/O.

It contains a oscillation circuit and clock gear circuit. The register SYSCR1<GEAR2:0>

changes clock gear to either 1, 2, 4, 8, or 16 (fc, fc/2, fc/4, fc/8, or fc/16), and these functions

can reduce the power consumption of the equipment in which the device is installed.

The system clock (fSYS) is set to fc/32 (fc/16 × 1/2) because of <GEAR2:0> = “100” by

resetting. For example, fSYS is set to 0.625 MHz by resetting the case of 20 MHz oscillator

is connected to X1, X2 pins.

The fc clock can be easily obtained by connecting a resonator to the X1/X2 pins

respectively. Clock input from an external oscillator is also possible.

Figure 3.3.4 Examples of Resonator Connection

Accurate adjustment of the oscillation frequency

The CLK pin outputs at 1/2 the system clock frequency (fSYS/2) is used to monitor the

oscillation clock.

With a system requiring adjustment of the oscillation frequency, an adjusting program must

be written.

74HCU04

(a) Crystal/Ceramic resonator

(b) External oscillator

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