参数资料
型号: M68HC05M68H
厂商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件页数: 81/130页
文件大小: 1541K
代理商: M68HC05M68H
Analog Subsystem
A/D Status and Control Register (ADSC)
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Analog Subsystem
81
obtained. See
9.3.2 Reference Voltage (VREFH)
for more
information.
ADON
A/D Subsystem On
When the A/D subsystem is turned on (ADON = 1), it requires a time,
t
ADON
, to stabilize before accurate conversion results can be attained.
CH2
CH0
Channel Select Bits
CH2, CH1, and CH0 form a 3-bit field which is used to select an input
to the A/D converter. Channels 0
3 correspond to port C input pins
PC6
PC3. Channels 4
6 are used for reference measurements.
Channel 7 is reserved. If a conversion is attempted with channel 7
selected, the result will be $00.
Table 9-1
lists the inputs selected by
bits CH0-CH3.
If the ADON bit is set and an input from channels 0
4 is selected, the
corresponding port C pin
s DDR bit will be cleared (making that port
C pin an input). If the port C data register is read while the A/D is on
and one of the shared input channels is selected using bit CH0
CH2,
the corresponding port C pin will read as a logic 0. The remaining port
C pins will read normally. To digitally read a port C pin, the A/D
subsystem must be disabled (ADON = 0), or input channels 5
7 must
be selected.
Table 9-1. A/D Multiplexer Input
Channel Assignments
Channel
Signal
0
AD0
port C, bit 6
1
AD1
port C, bit 5
2
AD2
port C, bit 4
3
AD3
port C, bit 3
4
V
REFH
port C, bit 7
5
(V
REFH
+ V
SS
)/2
6
V
SS
7
Reserved for factory test
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