HD6433308 Datasheet, PDF (341/349 Pages) Hitachi Semiconductor – Hitachi Single-Chip MicroComputer

ADCSR—A/D Control/Status Register
H’FFE8
A/D
Bit
7
6
5
4
3
2
1
0
ADF ADIE ADST SCAN CKS CH2 CH1 CH0
Initial value 0
0
0
0
0
0
0
0
Read/Write R/(W)* R/W R/W R/W R/W R/W R/W R/W
Channel Select
CH2 CH1 CH0
0 00
01
10
11
1 00
01
10
11
Single mode Scan mode
AN0
AN0
AN1
AN0, AN1
AN2
AN0 to AN2
AN3
AN0 to AN3
AN4
AN4
AN5
AN4, AN5
AN6
AN4 to AN6
AN7
AN4 to AN7
Clock Select
0 Conversion time = 242 states (max)
1 Conversion time = 122 states (max)
Scan Mode
0 Single mode
1 Scan mode
A/D Start
0 A/D conversion is halted.
1 1. Single mode: One A/D conversion is performed, then this bit is automatically cleared to “0.”
2. Scan mode: A/D conversion starts and continues cyclically on all selected channels until “0”
is written in this bit.
A/D Interrupt Enable
0 The A/D interrupt request (ADI) is disabled.
1 The A/D interrupt request (ADI) is enabled.
A/D End Flag
0 Cleared from “1” to “0” when CPU reads ADF = “1,” then writes “0” in ADF.
1 Set to “1” at the following times:
1. Single mode: at the completion of A/D conversion
2. Scan mode: when all selected channels have been converted.
* Software can write a “0” in bit 7 to clear the flag, but cannot write a “1” in this bit.
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