C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 185

• Manufacturer Part Number: C509-L_97
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

6.6.2 A/D Converter Registers
This section describes the bits/functions of all registers which are used by the A/D converter.
Special Function Registers ADDATH (Address D9 H )
Special Function Registers ADDATL (Address DA H )
The registers ADDATH and ADDATL contain the 10-bit conversion result in left justified data format.
The most significant bit of the 10-bit conversion result is bit 7 of ADDATH. The least significant bit
of the 10-bit conversion result is bit 6 of ADDATL. To get a 10-bit conversion result, both ADDAT
register must be read. If an 8-bit conversion result is required, only the reading of ADDATH is
necessary. The data remains in ADDAT until it is overwritten by the next converted data. ADDAT
can be read or written under software control. lf the A/D converter of the C509-L is not used, register
ADDATH can be used as an additional general purpose register.
Semiconductor Group
Bit No. MSB
DA H
D9 H
MSB
.1
.9
7
LSB
.8
.0
6
.7
–
5
.6
–
4
6-107
.5
3
–
On-Chip Peripheral Components
.4
2
–
.3
1
–
LSB
.2
0
–
Reset Value : 00 H
Reset Value : 00 H
ADDATH
ADDATL
1997-10-01
C509-L