参数资料
型号: MC68334GCFC20
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
封装: PLASTIC, QFP-132
文件页数: 63/76页
文件大小: 444K
代理商: MC68334GCFC20
MOTOROLA
MC68334
66
MC68334TS/D REV. 1
6.4 ADC Registers
The ADCMCR is used to initialize the ADC.
STOP — STOP Mode
0 = Normal operation
1 = Low-power operation
STOP places the ADC in low-power state by disabling the ADC clock and powering down the analog
circuitry. Setting STOP aborts any conversion in progress. STOP is set to logic level one at reset, and
may be cleared to logic level zero by the CPU.
Clearing STOP enables normal ADC operation. However, because analog circuitry bias current has
been turned off, there is a period of recovery before output stabilization.
FRZ[1:0] — Freeze 1
The FRZ field is used to determine ADC response to assertion of the FREEZE signal. The following
table shows possible responses.
SUPV — Supervisor/Unrestricted
0 = Unrestricted access
1 = Supervisor access
SUPV defines access to assignable ADC registers.
ADTEST — ADC Test Register
$YFF702
ADTEST is used during factory test of the ADC.
Port ADA is an input port that shares pins with the A/D converter inputs. The port ADA data register
resides in the lower half of the PDR. Bit 7 always returns zero when read.
PDR[6:0] — Port ADA Data
A read of PDR[6:0] will return the logic level of the port A pins. If the input is outside the defined voltage
range, the result of the read will be indeterminate. Use of a port A pin for digital input does not preclude
use as an analog input.
ADCMCR — ADC Module Configuration Register
$YFF700
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
STOP
FRZ
NOT USED
SUPV
NOT USED
RESET:
1
0
FRZ
Response
00
Ignore FREEZE
01
Reserved
10
Finish conversion, then freeze
11
Freeze immediately
PORTADA — Port ADA Data Register
$YFF706
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
PORT ADA DATA
RESET:
Reflects state of the input pins
相关PDF资料
PDF描述
MC68334MFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334AVFC20 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
MC68334VFC16 32-BIT, 16 MHz, MICROCONTROLLER, PQFP132
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