參數(shù)資料
型號: μPD789177Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 36/145頁
文件大?。?/td> 610K
代理商: ΜPD789177Y
Preliminary Product Information
35
μ
PD789166Y, 789167Y, 789176Y, 789177Y
(3) Subclock control register (CSS)
The CSS specifies whether the main system or subsystem clock oscillator is to be selected. It also specifies
how the CPU clock operates.
It is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears CSS to 00H.
Figure 5-10. Format of Subclock Control Register
CPU clock operation status
0
0
CLS
CSS0
0
0
0
0
CSS
Address
When reset
R/W
FFF2H
00H
R/W
Note
7
6
5
4
3
2
1
0
CLS
0
1
Operation based on the output of the divided main system clock
Operation based on the subsystem clock
Selection of the main system or subsystem clock oscillator
CSS0
0
1
Divided output from the main system clock oscillator
Output form the subsystem clock oscillator
Symbol
Note
Bit 5 is read-only.
Caution
Bits 0 to 3, 6, and 7 must be fixed to 0.
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