hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 444

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 A/D Converter
12.2
12.2.1
ADRRH and ADRRL together comprise a 16-bit read-only register for holding the results of
analog-to-digital conversion. The upper 8 bits of the data are held in ADRRH, and the lower 2
bits in ADRRL.
ADRRH and ADRRL can be read by the CPU at any time, but the ADRRH and ADRRL values
during A/D conversion are not fixed. After A/D conversion is complete, the conversion result is
stored as 10-bit data, and this data is held until the next conversion operation starts.
ADRRH and ADRRL are not cleared on reset.
12.2.2
AMR is an 8-bit read/write register for specifying the A/D conversion speed, external trigger
option, and the analog input pins.
Upon reset, AMR is initialized to H'30.
Rev. 7.00 Mar 10, 2005 page 402 of 652
REJ09B0042-0700
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
Register Descriptions
A/D Result Registers (ADRRH, ADRRL)
A/D Mode Register (AMR)
ADR9 ADR8 ADR7 ADR6 ADR5
Unde-
fined
R
7
Unde-
fined
CKS
R/W
R
6
7
0
Unde-
fined
R
5
TRGE
Unde-
fined
R/W
R
4
ADRRH
6
0
Unde-
fined
R
3
Unde-
ADR4 ADR3
fined


R
2
5
1
Unde-
fined
R
1
ADR2
Unde-
fined


4
1
R
0
Unde-
ADR1 ADR0
fined
R
7
CH3
R/W
Unde-
fined
3
0
R
6



5
CH2
R/W
2
0



4
ADRRL



3
CH1
R/W
1
0



2



1
CH0
R/W
0
0



0