MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 181

• Manufacturer Part Number: MC68HC711PH8
• Description: High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
• Manufacturer: Motorola

9.3
The multiplexer allows the A/D converter to select one of sixteen analog signals. Eight of these
channels correspond to port E input lines to the MCU, four others are internal reference points or
test functions; the remaining four channels are reserved. Refer to Table 9-1.
9.3.1
There are two types of single-channel operation. In the first type (SCAN = 0), the single selected
channel is converted four consecutive times. The first result is stored in A/D result register 1
(ADR1), and the fourth result is stored in ADR4. After the fourth conversion is complete, all
conversion activity is halted until a new conversion command is written to the ADCTL register. In
the second type of single-channel operation (SCAN = 1), conversions continue to be performed
on the selected channel with the fifth conversion being stored in register ADR1 (overwriting the
first conversion result), the sixth conversion overwriting ADR2, and so on.
MC68HC11PH8
Channel assignments
Single-channel operation
Table 9-1 A/D converter channel assignments
ANALOG-TO-DIGITAL CONVERTER
(1) Used for factory testing.
Channel
number
9Ð12
13
14
15
16
1
2
3
4
5
6
7
8
reserved
Channel
reserved
V
signal
V
V
RH
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
RH
RL
/2
(1)
(1)
(1)
(1)
Result in ADRx
if MULT = 1
ADR1
ADR2
ADR3
ADR4
ADR1
ADR2
ADR3
ADR4
ADR1
ADR2
ADR3
ADR4
Ñ
MOTOROLA
TPG
9-7
9