參數資料
型號: MC68HC05SB7
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: MO-150, SSOP-28
文件頁數: 4/170頁
文件大?。?/td> 2161K
代理商: MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
ANALOG SUBSYSTEM
MOTOROLA
REV 2.1
15-3
15.1
ANALOG MULTIPLEX REGISTERS
The Analog Multiplex Registers (AMUX1 and AMUX2) control the general inter-
connection and operation. The control bits in AMUX1 and AMUX2 are shown in
Figure 15-2 and Figure 15-2 respectively.
HOLD, DHOLD
These read/write bits control the source connection to the input to the negative
input of voltage comparator shown in Figure 15-1. This allows the channel
selection bus or the 1:2 divided channel selection bus to charge the internal
sample capacitor and to also be presented to comparator. The decoding of
these sources is given in Table 15-1. During a reset the HOLD bit is set and the
DHOLD bit is cleared, which connects the internal sample capacitor to the
channel selection bus. And since a reset also clears the MUX0:7 bits then the
channel selection bus will be connected to VSS and the internal sample capaci-
tor will be discharged to VSS following the reset.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
AMUX1
R
HOLD
DHOLD
INV
VREF
MUX3
MUX2
MUX1
MUX0
$0003
W
reset:
10000000
Figure 15-2. Analog Multiplex Register 1 (AMUX1)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
AMUX2
R
0
IBREF
MUX7
MUX6
MUX5
MUX4
$0007
W
reset:
00000000
Figure 15-3. Analog Multiplex Register 2 (AMUX2)
Table 15-1. Comparator Input Sources
HOLD
DHOLD
Case
Source To Negative Input of Comparator
0
Sample Hold
Internal sample capacitor connected to only the neg-
ative input of comparator; and subjected to a very
low leakage current.
0
1
Divided Input
Signal to channel selection bus is divided by 2 and
connected to both the internal sample capacitor and
negative input of comparator.
10
Direct
Input
Signal to channel selection bus is connected directly
to both the internal sample capacitor and negative
input of comparator.
1
Not allowed
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