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ST2202 Datasheet(PDF) 28 Page - List of Unclassifed Manufacturers

Part # ST2202
Description  8 BIT Integrated Microcontroller with 256K Bytes ROM
PDF  65 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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ST2202 Datasheet(HTML) 28 Page - List of Unclassifed Manufacturers

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Sitronix
ST2202
Ver 2.0a
28/65
2003-May-05
12.3 Timer 0
12.3.1 Function Description
The Timer0 is an 8-bit up counter. It can be used as a timer or
an event counter. T0C($25) is a real time read/write counter.
When an overflow from $FF to $00, a timer interrupt request
IRT0 will
be generated. Timer0 will stop counting when system clock
stops. Please refer to FIGURE 12-3.
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
SEL
OUT
PRES
MUX 8-1
T0M[2~0]
TCLK/65536
TCLK/32768
TCLK/8192
TCLK/2048
TCLK/256
TCLK/32
TCLK/8
TCLK/2
T0M[4]
T0M[5]
Reload
Enable
CLOCK
8 Bit - UP Counter
OUT
IRT0
Auto
DQ
CK
D Flip-Flop
SYSCK
FIGURE 12-3 Timer0 Structure
12.3.2 Timer0 Clock Source Control
Several clock sources can be chosen from for Timer0. It’s very
important that Timer0 can keep counting as long as SYSCK
stays active. Refer to TABLE 12-6.
TABLE 12-6 Clock Sources Of Timer0
T0M [2]
T0M [1]
T0M [0]
T0 T i m er C lock S ource
0
0
0
T C LK /65536
0
0
1
T C LK /32768
0
1
0
T C LK /8192
0
1
1
T C LK /2048
1
0
0
T C LK /256
10
1
T C LK /32
11
0
T C LK /8
11
1
T C LK /2
T0M[4] : Control automatic reload operation
0 : No auto reload
1 : Auto reload
T0M[5] : Control Timer 0 enable/disable
0 : Disable counting
1 : Enable counting
SENA : Prescaler enable bit
0 : TCLK stop
1 : TCLK counting
TABLE 12-7 Timer0 Register (T0C)
Address Name
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
$025
T0C
R/W
T0C[7]
T0C[6]
T0C[5]
T0C[4]
T0C[3]
T0C[2]
T0C[1]
T0C[0]
0000 0000
Bit 7-0:
T0C[7-0] : Timer0 up counter register



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