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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)： | 51/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD1724X |
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51
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
5.3
Carrier Generator for Remote Controller
μ
PD17246 is provided with a carrier generator for the remote controller.
The remote controller carrier generator consists of an 8-bit counter, NRZ high-level timer modulo register
(NRZHTMM), and NRZ low-level timer modulo register (NRZLTMM). The high-level and low-level periods are set in
the corresponding modulo registers through the DBF to determine the carrier duty factor and carrier frequency.
As a clock input to the 8-bit counter, f
X
/2, f
X
, or 2f
X
can be selected by using REMCK0 and REMCK1 (address 13H,
bits 0 and 1) of the register file (this clock for carrier generation is Rf
X
). When Rf
X
is oscillated by a 4 MHz resonator,
therefore, the input clock is 2 MHz (f
X
/2), 4 MHz (f
X
), or 8 MHz (2f
X
).
The NRZ high-level output timer modulo register is called NRZHTMM, and the NRZ low-level timer modulo register
is called NRZLTMM. Data is written to these registers by the PUT instruction. The contents in these register are read
by the GET instruction.
Whether the REM pin outputs a carrier or a high level is selected by REMEN (address 12H, bit 1) of the register
file. Be sure to clear this bit to 0 to output a carrier.
NRZLTMM
0
1
2
3
8-bit modulo register
4
5
6
Address
Peripheral register: 03H
After reset
Undefined
R/W
R/W
7
NRZHTMM
REMCK1
0
0
1
1
REMCK0
0
1
0
1
0
REMCK0
Address
RF: 13H
After reset
0H
R/W
R/W
1
REMCK1
2
0
3
0
Rf
X
= f
X
/2 (when f
X
= 4 MHz, Rf
X
= 2 MHz)
Rf
X
= f
X
(when f
X
= 4 MHz, Rfx = 4 MHz)
Rf
X
= 2f
X
Note
(when f
X
= 4 MHz, Rf
X
= 8 MHz)
0
1
2
3
8-bit modulo register
4
5
6
Address
Peripheral register: 03H
After reset
Undefined
R/W
R/W
7
Clock for carrier generation (Rf
X
)
Note
Rf
X
= 2f
X
can be selected only when f
X
= 3.5 to 4.5 MHz.
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