st2024c Sitronix Technology Corporation, st2024c Datasheet - Page 25

• Manufacturer Part Number: st2024c
• Description: 24k 8-bit Single Chip Microcontroller
• Manufacturer: Sitronix Technology Corporation

12.4 Base timer
Base timer is an 8-bit up counting timer. When it overflows
from $FF to $00, a timer interrupt request IRBT will be
generated. Please refer to Figure 11-7. :
12.4.2 Clock source control for Base Timer
Several clock sources can be selected for Base Timer.
Please refer to the following table:
Ver 2.2
* TCLK will stop when an ‘0’ is written to SENA(PRS[6]).
* SENA
PREW
PRES
X
X
X
X
0
1
1
1
1
BTM[3]
BTM[1~0]
BTM[1~0]
BTM[3]
OSCX/64
OSCX/16
OSCX/256
OSCX/4
TCLK/256
TCLK/32
0
0
0
0
0
1
1
1
1
TCLK/8
TCLK/2
TABLE 12-22: CLOCK SOURCE FOR BASE TIMER
IN0
IN1
IN2
IN3
IN0
IN1
IN2
IN3
BTM[2]
FIGURE 12-7: Structure of Base Timer
MUX 4-1
MUX4-1
X
X
X
X
X
X
X
X
X
SEL
SEL
OUT
OUT
BTM[1]
X
0
0
1
1
0
0
1
1
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IN0
IN1
BTM[0]
MUX
X
0
1
0
1
0
1
0
1
SEL
OUT
Base Timer source clock
8 Bit - UP Counter
CLOCK
STOP
TCLK / 256
TCLK / 32
TCLK / 8
TCLK / 2
OSCX / 256
OSCX / 64
OSCX / 16
OSCX / 4
IRBT
ST2024C
1/31/08