EM78468AQ EMC [ELAN Microelectronics Corp], EM78468AQ Datasheet - Page 28

• Manufacturer Part Number: EM78468AQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78468
8-BIT Microcontroller
24 •
4.2.16 IOC91/CNT12CR (Counter 1, 2 Control Register)
Bit 2 ~ 0 (WDTP2 ~ WDTP0) : watchdog timer pre-scaler bits. The WDT source clock is
sub-oscillation frequency.
Bit 7(CNT2S): Counter 2 clock source select 0/1 => Fs/ Fm*
(*Fs: sub-oscillator clock, Fm: main-oscillator clock)
Bit 6~4(CNT2P2~CNT2P0): Counter 2 pre-scaler select bits
Bit 3(CNT1S): Counter 1 clock source select 0/1 => Fs/ Fm
Bit 2~0 (CNT1P2~CNT1P0): Counter 1 pre-scaler select bits
CNT2S
Bit 7
CNT2P2
CNT1P2
WDTP2
(Address: 09h, Bit 0 of R5 = “1”)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
CNT2P2 CNT2P1 CNT2P0
Bit 6
CNT2P1
CNT1P1
WDTP1
Bit 5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 4
(This specification is subject to change without further notice)
CNT1P0
CNT1P0
WDTP0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CNT1S
Bit 3
Product Specification (V1.1) 04.11.2005
Counter 2 scale
Counter 1 scale
CNT1P2 CNT1P1 CNT1P0
Bit 2
WDT rate
1:1
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
Bit 1
Bit 0