sh6631a SinoWealth Micro-Electronics Corp. Ltd, sh6631a Datasheet - Page 6

• Manufacturer Part Number: sh6631a
• Description: Mask 4-bit Microcontroller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

4.3. Timer0 Mode Register
The timer can be programmed in several different pre-scaler ratios by setting Timer Mode Register (TM0).
The 8-bit counter counts pre-scaler 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
External T0 Input Control register
T0E: T0 signal edge
T0S: T0 signal source
Following is a block diagram showing the relations between T0.
Address
TM0.2
$1C
0
0
0
0
1
1
1
1
0: Increment on low-to-high transition T0 pin (Power on initial)
1: Increment on high-to-low transition T0 pin
0: OSC1/4 (Power on initial)
1: Transition on T0 pin
TM0.1
Bit3
0
0
1
1
0
0
1
1
-
TM0.0
Bit2
0
1
0
1
0
1
0
1
-
PA.0/T0
OSC/4
T0E
Figure. 2 Time related withT0
Bit1
T0S
TM0 [2:0]
Divide Ratio
0
1
Pre-scaler
M
U
X
/2
/2
/2
/2
/2
/2
/2
/2
Bit0
T0S
T0E
11
6
9
7
5
3
2
1
0
3
TIMER0
(8bits)
R/W
W
Bit0: T0 signal edge
Bit1: T0 signal source
2048 (initial)
Ratio N
Remarks
512
128
32
8
4
2
1
SH6631A