sh6636 SinoWealth Micro-Electronics Corp. Ltd, sh6636 Datasheet - Page 7

• Manufacturer Part Number: sh6636
• Description: Mask 4-bit Microcontroller With Remote Control Carrier Synthesizer
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

(b) Timer mode register
The timer can be programmed in several different prescaler ratios by setting the Timer Mode register (TM0).
The 8-bit counter prescaler overflow output pulses. The timer mode registers (TM0) are 3-bit registers used for timer control as
shown in Table 1. These mode registers select the input pulse sources into the timer.
Table 1. Timer0 Mode Register
5. System Clock and Oscillator
System clock generator produces the basic clock pulses that provide the system clock for the CPU and peripherals.
Instruction cycle time:
(1) 4/455KHz ( 8.79 s) for 455KHz system clock.
Oscillator
(1) Ceramic resonator: 400KHz - 2MHz.
(2) External input clock: 30KHz - 2MHz.
TM0.2
0
0
0
0
1
1
1
1
TM0.1
0
0
1
1
0
0
1
1
OSCO
OSCI
OSCO
OSCI
TM0.0
0
1
0
1
0
1
0
1
400K ~ 2MHz
Ceramic
C1
C2
Prescaler Divide Ratio
External clock source
7
/2
/2
/2
/2
/2
/2
/2
/2
C1, C2 Setting :
20p < C1 & C2 < 150p
(for reference only)
11
9
7
5
3
2
1
0
2048 (initial)
Ratio N
512
128
32
8
4
2
1
SH6636