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參數(shù)資料
| 型號(hào)： | UPD1713xA |
| 廠商： | NEC Corp. |
| 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(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 134/292頁(yè) |
| 文件大?。?/td> | 754K |
| 代理商： | UPD1713XA |
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CHAPTER 13 PERIPHERAL HARDWARE
115
13.1.2 Operation of 8-Bit Timers/Counters
(1) Count register
The count register of timers 0 and 1 is an 8-bit up counter whose initial value is 00H, and is incremented each
time a count pulse has been input.
The count register is initialized to 00H in the following cases.
(1) When this product is reset (refer to
CHAPTER 17 RESET
).
(2) When the contents of the 8-bit modulo register and the value of the count register coincide, and the
comparator generates a coincidence signal.
(3) In the case of timer 0, when “1” is written to TM0RES of the register file.
In the case of timer 1, when “1” is written to TM1RES of the register file.
(2) Modulo register
The modulo register of timers 0 and 1 determines the count value of the count register and its initial value is
set to FFH.
A value is set to the modulo register by using the PUT instruction via DBF (data buffer).
(3) Comparator
The comparator of timers 0 and 1 outputs a coincidence signal when the value of the count register and the
value of the modulo register coincide. If the value of the modulo register is the initial value FFH, for example,
the comparator outputs the coincidence signal when the count register counts 256.
The coincidence signal output from the comparator clears the contents of the count register to 0, and
automatically sets interrupt request flags (IRQTM0 and IRQTM1) to “1”. If the EI instruction (that enables
accepting interrupts) is executed, and if the interrupt enable flags (IPTM0 and IPTM1) are set at this time,
interrupts are accepted. When an interrupt has been accepted, the interrupt request flag (IRQTM0 or IRQTM1)
is cleared to “0”, and program execution branches to a specified interrupt routine.
13.1.3 Selecting Count Pulse
The count pulse for timer 0 is selected by TM0CK0 and TM0CK1.
As the count pulse, a pulse resulting from dividing the system clock (f
X
) by 256, 64, or 16, or an external count pulse
input from the INT pin can be selected.
At reset, f
X
/256 is selected as a count pulse because TM0CK0 = 0 and TM0CK1 = 0.
The count pulse for timer 1 is selected by TM1CK0 and TM1CK1.
As the count pulse, a pulse resulting from dividing f
X
by 1024, 512, or 256, or the count up signal from timer 0 can
be selected.
Timer 1 is also used to generate oscillation stabilization time on power application or at reset. Therefore, the initial
values are TM1CK0 = 0 and TM1CK1 = 0, and f
X
/512 is selected as the count pulse.
Because TM1EN = 1 as the initial condition, the
μ
PD17134A subseries starts program execution from address
0000H after it has been reset at f
X
= 8 MHz and after about 16.4 ms (about 65.5 ms at 2 MHz) (refer to
CHAPTER
17 RESET
).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD17P134A | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17P135A | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17P136ACT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17P136AGT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17P137ACT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17145 | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17145CT | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17145CTA1 | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17145GT | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD17145GTA1 | 制造商:NEC 制造商全稱:NEC 功能描述:SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS |
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