參數(shù)資料
型號(hào): μPD78F9177Y
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): 55/150頁
文件大?。?/td> 653K
代理商: ΜPD78F9177Y
Preliminary Product Information
53
μ
PD78F9177Y
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. Format of Clock Timer Mode Control Register
Clock timer count clock selection
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 set
WTM7
WTM6
WTM5
WTM4
0
0
WTM1
WTM0
WTM
7
6
5
4
Symbol
Address
When reset
R/W
FF4AH
00H
R/W
3
2
1
0
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
)
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