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參數(shù)資料
| 型號(hào)： | UPD17228MC |
| 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 |
| 文件頁數(shù)： | 29/84頁 |
| 文件大?。?/td> | 393K |
| 代理商： | UPD17228MC |
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μ
PD17225, 17226, 17227, 17228
29
Data Sheet U12643EJ2V0DS00
4.
CLOCK GENERATOR CIRCUIT
4.1
Instruction Execution Time (CPU Clock) Selection
The
μ
PD17225 is equipped with a clock oscillator that supplies clocks to the CPU and hardware peripherals. Instruction
execution time can be changed in two steps (ordinary mode and high-speed mode) without changing the oscillation
frequency.
To change the instruction execution time, change the mode of SYSCK (RF: address 02H) of the register file by using
the POKE instruction.
Note, that the mode is actually only changed when the instruction next to the POKE instruction has been executed.
When using the high-speed mode, pay attention to the supply voltage. (Refer to
13. ELECTRICAL SPECIFICA-
TIONS
.)
At reset, the ordinary mode is set.
3
2
1
0
0
0
0
SYSCK
Address:
RF : 02H
SYSCK
On reset:
0H
R/W:
R/W
0
1
Selects Instruction Execution Time
Ordinary mode 32/f
X
(8 s)
High-speed mode 16/f
X
(4 s)
Figures in ( ): indicate figures when system clock f
X
= 4 MHz.
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