EM78P468NBQSSLASHNBQJ datasheet(26/82 Pages) EMC

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EM78P468N/L

8-Bit Microcontroller

•

Product Specification (V1.6) 12.31.2007

(This specification is subject to change without further notice)

6.2.15 IOC81/WDTCR (WDT Control Register)

(Address: 08h, Bit 0 of R5 = “1”)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

−

WDTE

WDTP2

WDTP1

WDTP0

Bits 7 ~ 4:

Not used

Bit 3 (WDTE):

Watchdog timer enable. This control bit is used to enable the Watchdog

timer,

WDTE = “0”:

Disable WDT function

WDTE = “1”:

enable WDT function

Bits 2 ~ 0 (WDTP2 ~ WDTP0)

: Watchdog Timer prescaler bits. The WDT clock source

is sub-oscillation frequency.

WDTP2

WDTP1

WDTP0

WDT Rate

1:1

1:2

1:4

1:8

1:16

1:32

1:64

1:128

6.2.16 IOC91/CNT12CR (Counters 1, 2 Control Register)

(Address: 09h, Bit 0 of R5 = “1”)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CNT2S

CNT2P2

CNT2P1

CNT2P0

CNT1S

CNT1P2

CNT1P1

CNT1P0

Bit 7(CNT2S):

Counter 2 clock source select

“0”: Fs (Fs: sub-oscillator clock)

“1”: Fm (Fm: main-oscillator clock)

Bits 6~4 (CNT2P2 ~ CNT2P 0):

Counter 2 prescaler select bits

CNT2P2

CNT2P1

CNT1P0

Counter 2 Scale

1:2

1:4

1:8

1:16

1:32

1:64

1:128

1:256

EM78P468NBQS/NBQJ 数据表(PDF) 26 Page - ELAN Microelectronics Corp

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