C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 162

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

6.5.2
This section describes the bits/functions of the registers which are used by the A/D converter.
Special Function Register ADDAT (Address D9 H )
This register holds the result of the 8-bit conversion. The most significant bit of the 8-bit conversion
result is bit 7 and the least significant bit is bit 0 of the ADDAT register. The data remains in ADDAT
until it is overwritten by the next converted data. ADDAT can be read or written under software
control. If the A/D converter of the C505 is not used, register ADDAT can be used as an additional
general purpose register.
Special Function Register ADST (Address DA
This is the A/D conversion start register. Any write operation on the ADST register starts a new
conversion process irrespective of the actual data written to this register. Read by the CPU returns
unefined values.
Semiconductor Group
Bit No. MSB
Bit No. MSB
D9 H
DA H
A/D Converter Registers
.7
–
7
7
.6
–
6
6
.5
–
5
5
.4
–
4
4
6-100
H
.3
–
)
3
3
On-Chip Peripheral Components
.2
–
2
2
.1
–
1
1
LSB
LSB
.0
–
0
0
Reset Value : 00 H
Reset Value : XX
C505 / C505C
ADDAT
ADST
1997-08-01
H