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參數(shù)資料
| 型號： | UPD1724x |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 48/102頁 |
| 文件大?。?/td> | 461K |
| 代理商： | UPD1724X |
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48
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
5.
8-BIT TIMER AND REMOTE CONTROLLER CARRIER GENERATOR
The
μ
PD17246 is equipped with an 8-bit timer, which is mainly used to generate the leader pulse of the remote
controller signal and to output codes.
5.1
Configuration of 8-Bit Timer (with Modulo Function)
Figure 5-1 shows the configuration of the 8-bit timer.
As shown in this figure, the 8-bit timer consists of an 8-bit counter (TMC), an 8-bit modulo register (TMM), a
comparator that compares the value of the timer with the value of the modulo register, and a selector that selects the
operation clock of the 8-bit timer.
To start/stop the 8-bit timer, and to reset the 8-bit counter, TMEN (address 33H, bit 3) and TMRES (address 33H,
bit 2) of the register file are used. To select the operation clock of the 8-bit timer, use TMCK1 (address 33H, bit 1)
and TMCK0 (address 33H, bit 0) of the register file.
The value of the 8-bit counter is read by using the GET instruction through the DBF (data buffer). No value can
be set to the 8-bit counter. A value is set to the modulo register by using the PUT instruction through DBF. The value
of the modulo register cannot be read.
When the value of the counter matches with that of the modulo register, an interrupt flag (IRQTM: address 3FH,
bit 0) of the register file is set.
TMC
7
6
5
4
3
2
1
0
Address
After reset
R/W
Peripheral register: 05H
00H
R
8-bit counter
TMM
Address
After reset
R/W
Peripheral register: 06H
FFH
W
7
6
5
4
3
2
1
0
8-bit modulo register
Caution Do not clear TMM to 0 (IRQTM is not set).
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