参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 16/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
ANALOG SUBSYSTEM
MC68HC05SB7
15-14
REV 2.1
X = Don’t Care
Z
= High Impedance
15.2
ANALOG CONTROL REGISTER
The Analog Control Register (ACR) controls the power up, interrupt and ag oper-
ation. The analog subsystem draws about 470
A of current while it is operating.
The resulting power consumption can be reduced by powering down the analog
subsystem when not in use. This can be done by clearing two enable bits (ISEN
and CPEN) in the ACR at $001D. Since these bits are cleared following a reset,
the voltage comparator and the charge current source will be powered down fol-
lowing a reset of the device.
The control bits in the ACR are shown in Figure 15-2. All the bits in this register
are cleared by a reset of the device.
X
11110111
Z
ON
Z
ON
Z
X
11111000
Z
ON
ZZZZ
X
11111001
Z
ON
Z
ON
Z
X
11111010
Z
ON
Z
ON
Z
X
11111011
Z
ON
Z
ON
Z
X
11111100
Z
ON
Z
X
11111101
Z
ON
Z
ON
Z
X
11111110
Z
ON
Z
X
11111111
Z
ON
Z
0100000000
Z
ON
ZZZZZZZZZ
1000000000
ON
ZZZZZZZZZZ
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
ACR
R
CHG
ATD2
ATD1
ICEN
CPIE
CPEN
ISEN
$001D
W
reset:
00000000
Figure 15-5. Analog Control Register (ACR)
Table 15-2. Channel Select Bus Combinations
Analog Multiplex Registers
(AMUX1 and AMUX2)
Channel Select Bus Connected to:
V
R
E
F
I
B
R
E
F
M
U
X
7
M
U
X
6
M
U
X
5
M
U
X
4
M
U
X
3
M
U
X
2
M
U
X
1
M
U
X
0
VDD
VIB
AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0
VSS
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