MC68HC11A1 MOTOROLA [Motorola, Inc], MC68HC11A1 Datasheet - Page 42

• Manufacturer Part Number: MC68HC11A1
• Description: 8-Bit Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

ADCTL — A/D Control/Status
CCF — Conversions Complete Flag
SCAN — Continuous Scan Control
MULT — Multiple Channel/Single Channel Control
42
MOTOROLA
RESET:
E CLOCK
Set after an A/D conversion cycle. Cleared when ADCTL is written.
0 = Do four conversions and stop
1 = Convert four channels in selected group continuously
0 = Convert single channel selected
1 = Convert four channels in selected group
0
ANALOG
INPUT
PIN
Bit 7
CCF
CHANNEL, UPDATE
* THIS ANALOG SWITCH IS CLOSED ONLY DURING THE 12-CYCLE SAMPLE TIME.
CONVERT FIRST
U
SAMPLE ANALOG INPUT
ADR1
Figure 15 Electrical Model of an Analog Input Pin (Sample Mode)
12 E CYCLES
PROTECTION
< 2 pF
DEVICE
6
0
0
INPUT
32
SCAN
+ ~20V
– ~0.7V
U
5
CONVERT SECOND
CHANNEL, UPDATE
Figure 14 A/D Conversion Sequence
ADR2
CYCLES
MULT
MSB
U
4
4
+ ~12V
– ~0.7V
DUMMY N-CHANNEL
SUCCESSIVE APPROXIMATION SEQUENCE
OUTPUT DEVICE
BIT 6
CYC
64
2
CD
U
3
BIT 5
CYC
CHANNEL, UPDATE
CONVERT THIRD
2
BIT 4
CYC
ADR3
2
CC
U
2
BIT 3
CYC
2
BIT 2
CYC
DIFFUSION/POLY
2
JUNCTION
LEAKAGE
96
CB
U
400 nA
1
COUPLER
BIT 1
CYC
CONVERT FOURTH
CHANNEL, UPDATE
2
4 K
$1030
CYC
LSB
ADR4
2
Bit 0
CA
U
CYC
END
~ 20 pF
2
MC68HC11A8TS/D
*
128 — E CYCLES
MC68HC11A8
CAPACITANCE
V
RL
A/D CONVERSION TIM
ANALOG INPUT PIN
DAC