H8SXSLASH1663 datasheet(691/1158 Pages) RENESAS

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Section 13 32K Timer (TM32K)

Rev.1.00 Jun. 07, 2006 Page 639 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description



Reserved

These bits are always read as 1 and cannot be modified.

OSC32STP*

R/W

32-kHz Oscillator Stop

0: Starts the 32-kHz oscillator

1: Stops the 32-kHz oscillator

CKS1

CKS0

R/W

Clock Select 1, 0

Select the clock source to be input to TCNT32K. The

overflow cycle for SUBCK = 32.768 kHz is indicated in

parentheses.

00: Clock SUBCK/32 (cycle: 250 ms)

01: Clock SUBCK/64 (cycle: 500 ms)

10: Clock SUBCK/128 (cycle: 1 s)

11: Clock SUBCK/512 (cycle: 2 s)

Note:

When the CK32K bit in SUBCKCR is 1, 1 cannot be written to this bit.

13.3

Operation

Setting 1 to the TME bit in TCR32K starts the count-up operation.

A 32K timer interrupt (32KOVI) is generated each time TCNT32K overflows. Therefore, an

interrupt can be generated at intervals with a cycle determined by the clock select bits 0 and 1.

H'FF

H'00

32KOVI

Time

32KOVI

32KOVI: 32K timer interrupt

32KOVI

Overflow

TCNT32K value

3 clocks of 32K

Overflow

TME = 1

Figure 13.2 32K Timer Operation

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