參數(shù)資料
型號: MC68HRC705JP7CP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 139/164頁
文件大?。?/td> 1165K
代理商: MC68HRC705JP7CP
Analog Subsystem
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
76
Freescale Semiconductor
Therefore, input voltages cannot be resolved if they are less than the sum
of the AVSS offset and the comparator offset, because they will always yield
a low output from the comparator.
8.3 Analog Control Register
The analog control register (ACR) controls the power-up, interrupt, and flag operation. The analog
subsystem draws current while it is operating. The resulting power consumption can be reduced
by powering down the analog subsystem when not in use (refer to 15.5 Supply Current Characteristics
(VDD = 4.5 to 5.5 Vdc)). This can be done by clearing three enable bits (ISEN, CP1EN, and CP2EN) in
the ACR at $001D. Since these bits are cleared following a reset, the voltage comparators and the charge
current source will be powered down following a reset of the device.
The control bits in the ACR are shown in Figure 8-5. All the bits in this register are cleared by a reset of
the device.
Table 8-2. Channel Select Bus Combinations
Analog Multiplex Register
Channel Select Bus Connected to:
VREF
MUX4
MUX3
MUX2
MUX1
VDD
PB4/AN4/
TCMP
PB3/AN3/
TCAP
PB2/AN2
PB1/AN1
VSS
0
Hi-Z
On
X(1)
1. Don/t care
0
1
Hi-Z
On
Hi-Z
X(1)
0
1
0
Hi-Z
On
Hi-Z
X(1)
0
1
Hi-Z
On
Hi-Z
X(1)
0
1
0
Hi-Z
On
Hi-Z
X(1)
0
1
0
1
Hi-Z
On
Hi-Z
On
Hi-Z
X(1)
0
1
0
Hi-Z
On
Hi-Z
X(1)
0
1
Hi-Z
On
Hi-Z
X(1)
1
0
Hi-Z
On
Hi-Z
X(1)
1
0
1
Hi-Z
On
Hi-Z
On
Hi-Z
X(1)
1
0
1
0
Hi-Z
On
Hi-Z
On
Hi-Z
X(1)
1
0
1
Hi-Z
On
Hi-Z
On
Hi-Z
X(1)
1
0
Hi-Z
On
Hi-Z
X(1)
1
0
1
Hi-Z
On
Hi-Z
On
Hi-Z
X(1)
1
0
Hi-Z
On
Hi-Z
X(1)
1
Hi Z
On
Hi Z
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