em78p468l ELAN Microelectronics Corp, em78p468l Datasheet - Page 26

• Manufacturer Part Number: em78p468l
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78P468N/EM78P468L
8-Bit Microcontroller
20 •
6.2.15 IOC81/WDTCR (WDT Control Register)
6.2.16 IOC91/CNT12CR (Counters 1, 2 Control Register)
Bits 7 ~ 4: Not used
Bit 3 (WDTE): Watchdog timer enable. This control bit is used to enable the Watchdog
Bits 2 ~ 0 (WDTP2 ~ WDTP0) : Watchdog Timer prescaler bits. The WDT clock source
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
CNT2S
Bit 7
Bit 7
−
CNT2P2
WDTE = “0”: Disable WDT function
WDTE = “1”: enable WDT function
(Address: 08h, Bit 0 of R5 = “1”)
timer,
is sub-oscillation frequency.
(Address: 09h, Bit 0 of R5 = “1”)
WDTP2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
CNT2P2
Bit 6
Bit 6
−
CNT2P1
CNT2P1
Bit 5
Bit 5
−
0
0
1
1
0
0
1
1
WDTP1
0
0
1
1
0
0
1
1
CNT2P0
Bit 4
Bit 4
(This specification is subject to change without further notice)
−
CNT1P0
CNT1S
0
1
0
1
0
1
0
1
WDTE
Bit 3
Bit 3
Product Specification (V1.5) 02.15.2007
WDTP0
0
1
0
1
0
1
0
1
CNT1P2
WDTP2
Counter 2 Scale
Bit 2
Bit 2
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
CNT1P1
WDTP1
Bit 1
Bit 1
WDT Rate
1:128
1:16
1:32
1:64
1:1
1:2
1:4
1:8
CNT1P0
WDTP0
Bit 0
Bit 0