參數(shù)資料
型號: μPD789187
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 53/146頁
文件大?。?/td> 630K
代理商: ΜPD789187
Preliminary Product Information
53
μ
PD789186, 789187, 789196, 789197
6.5.3
Register for controlling the clock timer
The clock timer mode control register (WTM) is used to control the clock timer.
Clock timer mode control register (WTM)
The WTM selects a count clock for the clock timer and specifies whether to enable clocking of the timer. It
also specifies the prescaler interval and how the 5-bit counter is controlled.
The WTM is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears the WTM to 00H.
Figure 6-24. Clock Timer Mode Control Register Format
Clock timer count clock selection
WTM7 WTM6 WTM5 WTM4
0
0
WTM1 WTM0
WTM
Symbol
Address
When reset
R/W
FF4AH
00H
R/W
7
6
5
4
3
2
1
0
WTM7
0
1
Prescaler interval selection
WTM6
0
0
0
0
1
1
2
4
/f
W
2
5
/f
W
2
6
/f
W
2
7
/f
W
2
8
/f
W
2
9
/f
W
WTM5
0
0
1
1
0
0
WTM4
0
1
0
1
0
1
5-bit counter operation control
WTM1
0
1
Cleared after stop
Started
Clock timer operation
WTM0
0
1
Operation disabled (both prescaler and timer cleared)
Operation enabled
Other settings
f
X
/2
7
f
XT
(39.1 kHz)
(32.768 kHz)
Not to be specified
Remarks 1.
f
W
: Clock timer clock frequency (f
X
/2
2.
f
X
: Main system clock oscillation frequency
3.
f
XT
: Subsystem clock oscillation frequency
4.
The parenthesized values apply to operation at f
X
= 5.0 MHz or f
XT
= 32.768 kHz.
7
or f
XT
)
相關(guān)PDF資料
PDF描述
μPD789197 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
μPD789186 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
μPD789198 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
μPD789216Y 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
μPD789217Y 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD78F0134 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134(A) 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134(A1) 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134A 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134A1 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers