Z51F0410 Datasheet, PDF (136/184 Pages) Zilog, Inc. – Z8051 Series 8-Bit Microcontrollers

Z51F0410
Product Specification
4.9.4 Register Map
Name
ACCSR
Table 4.17 Analog Comparator Register Map
Address
E9H
Dir
Default
Description
R/W
00H
Analog Comparator Control & Status Register
4.9.5 Analog Comparator Register description
Analog Comparator Register has one control register, Analog Comparator Control & Status Register
(ACCSR). Note that AMUXENB is the inverted signal of AMUXEN bit which comes from ADC’s
ADCM2 register
4.9.6 Register description for Analog Comparator
ACCSR (Analog Comparator Control & Status Register) : E9H
7
6
5
ACE
ACBG
ACO
R/W
R/W
R
4
ACIF
R
3
ACIE
R/W
2
1
0
-
ACISM1
ACISM0
-
R/W
R/W
Initial value : 00H
ACE
ACBG
ACO
ACIF
ACIE
ACISM[1:0]
Enable Analog Comparator (AC).
0
Disable AC (power down)
1
Enable AC
Select (-) input source of AC, Band Gap Reference Voltage or AN4.
0
(-) input is from AN4
1
(-) input is from Band Gap Reference Voltage
This bit represents the value of ACOUT (Output of Analog Comparator).
ACO bit is sampled by SCLK, system clock, twice. When ACE is ‘0’, this
bit is also cleared.
0
Comparator output is LOW
1
Comparator output is HIGH
This bit is set when an Analog Comparator Interrupt is generated
according to the ACISM[1:0] bits. This bit is cleared when Analog
Comparator Interrupt is executed or ‘0’ is written to this bit field.
0
No interrupt generated or cleared
1
Interrupt generated
Enable Analog Comparator Interrupt.
0
Disable Interrupt, Polling mode operation
1
Enable Interrupt
Select Interrupt Mode of Analog Comparator.
ACISM1 ACISM0 Description
0
0
Reserved
0
1
Interrupt on falling edge of ACOUT
1
0
Interrupt on rising edge of ACOUT
1
1
Interrupt on both edge of ACOUT
PSR1 (Comparator Pin Selection Register) : A0H
7
6
5
4
3
2
PS029502-0212
PRELIMINARY
1
0
ACO_EN
133