MC68HC11F1 Datasheet, PDF (56/68 Pages) Motorola, Inc – Technical Summary 8-Bit Microcontroller

ADR1 – ADR4 — A/D Results
$x031 – $x034
$x031
Bit 7
6
5
4
3
2
1
Bit 0
ADR1
$x032
Bit 7
6
5
4
3
2
1
Bit 0
ADR2
$x033
Bit 7
6
5
4
3
2
1
Bit 0
ADR3
$x034
Bit 7
6
5
4
3
2
1
Bit 0
ADR4
Each read-only result register holds an eight-bit conversion result. Writes to these registers have no ef-
fect. Data in the A/D converter result registers is valid when the CCF flag in the ADCTL register is set,
indicating a conversion sequence is complete. If conversion results are needed sooner, refer to Figure
16, which shows the A/D conversion sequence diagram.
Table 25 Analog Input to 8-Bit Result Translation Table
Percentage¹
Volts²
Bit 7
50%
2.500
6
25%
1.250
NOTES:
1. % of VRH–VRL
2. Volts for VRL = 0; VRH = 5.0 V
5
12.5%
0.625
4
6.25%
0.3125
3
3.12%
0.1562
2
1.56%
0.0781
1
0.78%
0.0391
Bit 0
0.39%
0.0195
OPTION — System Configuration Options
Bit 7
6
5
ADPU CSEL IRQE*
RESET:
0
0
0
4
DLY*
1
3
CME
0
2
FCME*
0
1
CR1*
0
Bit 0
CR0*
0
$x039
*Can be written only once in first 64 cycles out of reset in normal modes, or at any time in special modes.
ADPU — A/D Power Up
0 = A/D powered down
1 = A/D powered up
CSEL — Clock Select
0 = A/D and EEPROM use system E-Clock
1 = A/D and EEPROM use internal RC clock
Bits [5:0] — Refer to 4.3 System Initialization Registers, page 23.
MOTOROLA
56
MC68HC11F1/FC0
MC68HC11FTS/D