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參數資料
| 型號： | KS57C2504 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數： | 47/94頁 |
| 文件大?。?/td> | 763K |
| 代理商： | KS57C2504 |
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S3C7254
PRODUCT SPECIFICATION
4–47
TC0 MODE REGISTER (TMOD0)
TMOD0 is the 8-bit mode control register for
timer/counter 0. TMOD0.2 is the enable/disable bit
for timer/counter 0. When TMOD0.3 is set to "1", the
contents of TCNT0, IRQT0, and TOL0 are cleared,
counting starts from 00H, and TMOD0.3 is
automatically reset to "0" for normal TC0 operation.
When TC0 operation stops (TMOD0.2 = "0"), the
contents of the TC0 counter register TCNT0 are
retained until TC0 is re-enabled.
Table 21. TC0 Mode Register (TMOD0) Organization
Bit Name
TMOD0.7
TMOD0.6
TMOD0.5
TMOD0.4
TMOD0.3
Setting
0
Resulting TC0 Function
Address
Always logic zero
F91H
0,1
Specify input clock edge and internal frequency
1
Clear TCNT0, IRQT0, and TOL0 and resume counting
immediately (This bit is automatically cleared to logic zero
immediately after counting resumes.)
Disable timer/counter 0; retain TCNT0 contents
Enable timer/counter 0
Always logic zero
Always logic zero
TMOD0.2
0
1
0
0
F90H
TMOD0.1
TMOD0.0
Table 22. TMOD0.6, TMOD0.5, and TMOD0.4 Bit Settings
TMOD0.6
0
0
1
TMOD0.5
0
0
0
TMOD0.4
0
1
0
Resulting Counter Source and Clock Frequency
External clock input (TCL0) on rising edges
External clock input (TCL0) on falling edges
fxx/2
10
(4.09 kHz)
fxx /2
6
(65.5 kHz)
fxx/2
4
(262 kHz)
fxx = 4.19 MHz
1
0
1
1
1
0
1
1
1
NOTE
:
'fxx' = selected system clock of 4.19 MHz.
PROGRAMMING TIP — Restarting TC0 Counting Operation
1.
Set TC0 timer interval to 4.09 kHz:
BITS
EMB
SMB
15
LD
EA,#4CH
LD
TMOD0,EA
EI
BITS
IET0
2.
Clear TCNT0, IRQT0, and TOL0 and restart TC0 counting operation:
BITS
EMB
SMB
15
BITS
TMOD0.3
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