MC68HCP11 Datasheet, PDF (43/45 Pages) Motorola, Inc – 8-Bit Microcontroller

CD–CA — Channel Select D through A
Table 10 A/D Converter Channel Assignments
Channel Select Control Bits
CD
CC
CB
CA
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
X
X
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Channel
Signal
AN0
AN1
AN2
AN3
AN4*
AN5*
AN6*
AN7*
Reserved
V_RH**
V_RL**
(V_RH)/2**
Reserved**
Result in ADRx if
MULT = 1
ADR1
ADR2
ADR3
ADR4
ADR1
ADR2
ADR3
ADR4
ADR1–ADR4
ADR1
ADR2
ADR3
ADR4
* Not available in 48-pin package
**Used for factory testing
ADR1–ADR4 — A/D Results
$1031–$1034
Bit 7
6
5
4
3
2
1
Bit 0
$1031 Bit 7
6
5
4
3
2
1
Bit 0 ADR1
$1032 Bit 7
6
5
4
3
2
1
Bit 0 ADR2
$1033 Bit 7
6
5
4
3
2
1
Bit 0 ADR3
$1034 Bit 7
6
5
4
3
2
1
Bit 0 ADR4
Table 11 Analog Input to 8-Bit Result Translation Table
Bit 7
% ⁽¹⁾
50%
Volts ⁽²⁾
2.500
(1) _{% of VRH–VRL}
6
25%
5
12.5%
4
6.25%
3
3.12%
1.250 0.625 0.3125 0.1562
(2) _{VRL = 0.0 V; VRH = 5.0 V}
2
1.56%
0.0781
1
0.78%
0.0391
Bit 0
0.39%
0.0195
OPTION — System Configuration Options
$1039
Bit 7
6
5
4
3
2
1
Bit 0
ADPU CSEL IRQE* DLY* CME
0
CR1* CR0*
RESET:
0
0
0
1
0
0
0
0
*Can be written only once in first 64 cycles out of reset in normal modes, or any time in special modes.
ADPU — A/D Power Up
0 = A/D Converter powered down
1 = A/D Converter powered up
CSEL — Clock Select
0 = A/D and EEPROM use system E clock
1 = A/D and EEPROM use internal RC clock
MC68HC11A8
MC68HC11A8TS/D
MOTOROLA
43