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參數(shù)資料
| 型號(hào)： | UPD17201A |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片機(jī)與LCD控制器/驅(qū)動(dòng)器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì) |
| 文件頁(yè)數(shù)： | 38/120頁(yè) |
| 文件大?。?/td> | 516K |
| 代理商： | UPD17201A |
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μ
PD17201A, 17207
38
7.3
REMOTE CONTROLLER CARRIER GENERATOR
The
μ
PD17207 is equipped with a circuit to generate carriers for the remote controller.
This circuit consists of a 6-bit counter, a modulo register (NRZHTMM) to determine an NRZ high-level period, a
modulo register (NRZLTMM) to determine an NRZ low-level period, and a comparator.
A carrier duty factor and a carrier frequency are determined by the contents of these modulo registers. The values
of the high- and low-level periods are set in the corresponding modulo registers via the data buffers (DBF).
A clock signal input to the 6-bit counter is obtained by dividing the frequency of the system clock signal by two (e.g,
2 MHz with a system clock of 4 MHzf
X
or 16.384 kHz with a system clock of f
XT
= 32.768 kHz).
Modulo registers NRZHTMM and NRZLTMM are respectively resident on peripheral addresses 04H and 03H.
These registers can be written by the PUT instruction and read by the GET instruction
7.3.1
Remote Controller Signal Output Control
The output of the REM pin which outputs carriers is controlled by NRZ (bit 0, address 12H of the register file), NRZBF
(bit 0, address 11H of the register file), and an 8-bit timer.
While NRZ is “1”, the REM pin outputs a carrier signal generated by the remote controller carrier generator. While
NRZ is “0”, the output of the REM pin is low. The contents of the NRZBF are automatically set in the NRZ flag by
an interrupt signal generated by the 8-bit timer. When data is set in the NRZBF flag in advance, the status of the output
of the REM pin varies in synchronization with the counting operation of the 8-bit timer.
The content of the NRZ flag is output to the LED pin. Namely, the LED pin outputs a high-level signal when NRZ
is “1” and a low-level signal when NRZ is “0”.
If the 8-bit timer generates an interrupt signal when the output of the REM pin is high, that is, when NRZ is “1” and
a carrier signal is high, the output of the REM pin does not match the contents of NRZ until the carrier signal goes
low.
This operation is required to hold the pulse width of high carrier pulses constant. (See Fig. 7-3.)
When NRZ is “0”, the carrier generation circuit stops. In a system using the output of the remote controller carrier
generator as a clock signal for the 8-bit timer, clock pulses are continuously supplied even after NRZ has become
“0”.
Fig. 7-3 Remote Controller Carrier Output
Note
This is the value when (TMCK1, TMCK0)
≠
(1,1).
The value when (TMCK1, TMCK0) = (1, 1) differs depending on the manipulation of NRZ.
If NRZ is set to 1 by an instruction, the width of the first high-level pulse may be narrowed. If NRZ is set
by means of transfer from NRZBF, the delay in the above chart is equivalent to the low-level pulse width
of the carrier clock.
LED(NRZ)
REM
Delay
Note
The REM pin does not go
low before the carrier
signal goes low even when
NRZ is
“
0
”
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD17201AGF | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD17207 | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD17207GF | 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD17202AGF-011 | Circular Connector; No. of Contacts:56; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:25-4 RoHS Compliant: No |
| UPD17202AGF-011-3BE | Circular Connector; No. of Contacts:56; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:25-4 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17201AGF | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD17201AGF-XXX-3B9 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17202A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UPD17202AGF-011 Preliminary Data Sheet | Data Sheet[05/1997] |
| UPD17202AGF-011 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC FRONT PANEL CONTROLLER |
| UPD17202AGF-011-3BE | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC FRONT PANEL CONTROLLER |
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