參數(shù)資料
型號: μPD789406
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): 62/128頁
文件大?。?/td> 607K
代理商: ΜPD789406
62
μ
PD789405, 789406, 789407
5.8.3 Comparator control register
The comparator is controlled by the following register.
(1) Comparator mode register (CMPRM0)
CMPRM0 controls the power supply and output of the comparator. It also selects an open drain output for the
comparator.
CMPRM0 is set using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears CMPRM0 to 00H.
Figure 5-29. Comparator Mode Register Format
CMPON
0
1
Comparator power supply ON/OFF control
0
0
0
CMPON
SELCMP
OPDR
CMPOUT
CMPRM0
Symbol
Address
When reset
R/W
FF4EH
00H
R/W
Note
6
7
5
4
3
2
1
0
SELCMP
0
1
Clock output control
OPDR
0
1
Open-drain output selection
CMPOUT
0
Comparator power supply OFF
Comparator power supply ON
8-bit timer counter (TM2) output
8-bit timer counter 2 (TM2) output if CMPREF0 > CMPIN0
CMOS output
Open-drain output
The comparator output is read.
Note
Bit 0 is read-only.
Cautions 1. Bits 4 to 7 must be fixed to 0.
2.
If the comparator is enabled, noise may be induced. If it is necessary to generate an
interrupt request signal (INTCMP) from the output of the comparator, enable the
comparator before enabling interrupts.
3.
Similarly, if it is necessary to direct the output of the comparator to the port, enable the
comparator in advance.
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