H8SXSLASH1663R datasheet(877/1504 Pages) RENESAS

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Section 17 32K Timer (TM32K)

Rev. 2.00 Sep. 24, 2008 Page 845 of 1468

REJ09B0412-0200

Section 17 32K Timer (TM32K)

The 32K timer (TM32K) is a 24-bit timer. Either 8- or 24- counter operation is selectable. It

generates a 32K timer interrupt every time the interrupt period of the counter elapses. Figure 17.1

shows a block diagram of the TM32K.

17.1

Features

• A 32K timer interrupt (32KOVI) is generated at the overflow interval for the counter.

• Eight interrupt overflow cycles of 250 ms, 500 ms, 1 s, 2 s, 30 s, 60 s, approx. 22.7 days, and

approx. 45.5 days settable.

• Counter operational except in hardware standby mode or the reset state.

• Canceling software standby mode and deep software standby mode is possible.

Clock divider

SUBCK/32

SUBCK/64

SUBCK/128

SUBCK/256

SUBCK/16384

SUBCK/32768

Internally

divided

clock

32KOVI

(Interrupt request

signal)

Subclock (SUBCK)

(32.768KHz)

EXCKSN

TME

CKS1/0

TCR32K

Module bus

Bus interface

Counter

TK32K

TCNT32K1 (8 bits)

TCNT32K2 (8 bits)

TCNT32K3 (8 bits)

[Legend]

TCR32K:

Timer control register

TCNT32K 1 to 3: Timer counter

Figure 17.1 Block Diagram of TM32K

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