參數資料
型號: MC68HC705SP7CP
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: 124/164頁
文件大小: 1165K
代理商: MC68HC705SP7CP
Parallel Input/Output
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
62
Freescale Semiconductor
4.
If the PB4 pin is to be an input to the analog subsystem or a digital input, then the DDRB4 bit must
be cleared. In this case, the PB4 pin can still be read, but the voltage present will be returned as a
binary value. Depending on the external application, the PB4 pulldown may also be disabled by
setting the PDIB4 pulldown inhibit bit. In this case, both the digital and analog functions connected
to this pin can be utilized.
.
Table 7-2. Port B Pin Functions — PB0–PB4
Port B
Pin
Control Bits
PORTB Access
(Pin or Data
Register)
Result on
Port B Pins
Comparator 1
Timer
SWPDI
in MOR
Port B
CMP1 COE1
OPT in COPR
OLVL
PDIBx
DDRBx(1)
1. DDRB can always be read or written.
Read
Write
Pulldown
Pin
PB0
PB1
PB2
PB3
X(2)
2. Don’t care
X(2)
000
Pin
Data
On
PBx in
010
Pin
Data
Off
PBx in
1
X(2)
0
Pin
Data
Off
PBx in
X(2)
1
Data
Off
PBx out
PB4
X(2)
000
Pin
Data
On
PB4 in
010
Pin
Data
Off
PB4 in
1
X(2)
0
Pin
Data
Off
PB4 in
X(2)
00
X(2)
1
Data
Off
PB4 out
X(2)
010
X(2)
1
Data
Off
PB4 out
0
110
X(2)
1
Data
Off
PB4 out
X(2)
1
X(2)
11
Data
Off
1
11
1
X(2)
11
Data
Off
1
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