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參數(shù)資料
| 型號： | UPD17246MC-xxx-5A4 |
| 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 |
| 文件頁數(shù)： | 47/102頁 |
| 文件大?。?/td> | 461K |
| 代理商： | UPD17246MC-XXX-5A4 |
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47
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
4.
CLOCK GENERATOR
4.1
Instruction Execution Time (CPU Clock) Selection
The
μ
PD17246 is equipped with a clock oscillator that supplies clocks to the CPU and peripheral hardware.
Instruction execution time can be changed in two steps (normal 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
14. ELECTRICAL SPECIFICATIONS
.)
After reset, the normal mode is set.
3
2
1
0
0
0
0
SYSCK
Address
RF: 02H
SYSCK
After reset
0H
R/W
R/W
0
1
Selects instruction execution time
Normal mode 32/f
X
(8 s)
High-speed mode 16/f
X
(4 s)
Values in parentheses apply to operation when the system clock f
X
= 4 MHz.
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| UPD17704GC | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17704GC-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 |
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