參數(shù)資料
型號: μPD789166Y
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): 53/145頁
文件大小: 610K
代理商: ΜPD789166Y
Preliminary Product Information
52
μ
PD789166Y, 789167Y, 789176Y, 789177Y
5.5.3
Clock timer control register
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 5-24. Format of Clock Timer Mode Control Register
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 set
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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