Справочник Пользователя для IBM MiEM78P468N

EM78P468N/EM78P468L

8-Bit Microcontroller

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Product Specification (V1.5) 02.15.2007

(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

0 0 0 1:1

0 0 1 1:2

0 1 0 1:4

0 1 1 1:8

1 0 0

1:16

1 0 1

1:32

1 1 0

1:64

1 1 1

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 0/1

→ Fs/ Fm*

(*Fs: sub-oscillator clock, Fm: main-oscillator clock)

Bits 6~4 (CNT2P2 ~ CNT2P 0):

Counter 2 prescaler select bits

CNT2P2

CNT2P1

CNT1P0

Counter 2 Scale

0 0 0

1:2

0 0 1

1:4

0 1 0

1:8

0 1 1