TMP86CS64AFG datasheet(23/202 Pages) TOSHIBA

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Page 13

TMP86CS64AFG

2.2 System Clock Controller

The system clock controller consists of a clock generator, a timing generator and a operating mode controller.

Figure 2-2 System Clock Controller

2.2.1 Clock Generator

The clock generator generates the basic clock which provides the system clocks to be supplied to the CPU

core and peripheral hardware. The clock generator contains two oscillators used for the high- and low-fre-

quency clocks. Power consumption can be reduced by the low-speed operation with the low-frequency clock,

which is switched by the operating mode controller.

The high-frequency clock (fc) or low-frequency clock (fs) can be obtained easily by connecting a resonator

between the XIN and XOUT pins, or XTIN and XTOUT pins, respectively. The clock can be supplied from an

external oscillator. In this case, supply the clock via the XIN or XTIN pin, and leave the XOUT or XTOUT

pins unconnected.

Figure 2-3 Example Resonator Connection

Note:The hardware feature does not provide the function to monitor externally the basic clock directly. However,

with disabling all interrupts and watchdog timers, the oscillation frequency can be adjusted by programming to

output a fixed-frequency pulse (i.e., clock output) to a port and monitoring the pulse. For the system to require

the adjustment of the oscillation frequency, the adjustment program must be created beforehand.

Timing generator

Operating mode controller

High-frequency

clock oscillator

TBTCR

SYSCR2

SYSCR1

XIN

XOUT

XTIN

XTOUT

Clock

generator

0036H

0038H

0039H

System clock

Timing generator

control register

CGCR

0030H

Divider control

System control register

Oscillate/Stop control

Low-frequency

clock oscillator

XIN

High-frequency clock

XOUT

(a) Crystal or ceramic

resonator

XIN

XOUT

(b) External oscillator

(Unconnected)

XTIN

Low-frequency clock

XTOUT

XTIN

XTOUT

(d) External oscillator

(Unconnected)

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