H8SLASH3028F datasheet(471/923 Pages) RENESAS

471 / 923 page

Rev. 2.00, 09/03, page 441 of 890

Bit 6—Timer Mode Select (WT/

IT): Selects whether to use the WDT as a watchdog timer or

interval timer. If used as an interval timer, the WDT generates an interval timer interrupt request

when TCNT overflows. If used as a watchdog timer, the WDT generates a reset signal when

TCNT overflows.

Bit 6

WT/

Description

Interval timer: requests interval timer interrupts

(Initial value)

Watchdog timer: generates a reset signal

Bit 5—Timer Enable (TME): Selects whether TCNT runs or is halted. When WT/

IT = 1, clear

the software standby bit (SSBY) to 0 in SYSCR before setting TME. When setting SSBY to 1,

TME should be cleared to 0.

Bit 5

TME

Description

TCNT is initialized to H'00 and halted

(Initial value)

TCNT is counting

Bits 4 and 3—Reserved: These bits cannot be modified and are always read as 1.

Bits 2 to 0—Clock Select 2 to 0 (CKS2/1/0): These bits select one of eight internal clock sources,

obtained by prescaling the system clock (

φ), for input to TCNT.

Bit 2

CKS2

Bit 1

CKS1

Bit 0

CKS0

Description

000

φ/2

(Initial value)

φ /32

φ /64

φ /128

100

φ /256

φ /512

φ /2048

φ /4096

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