參數(shù)資料
型號: MC68HC08GP8ACFB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, QFP-44
文件頁數(shù): 26/126頁
文件大?。?/td> 4243K
代理商: MC68HC08GP8ACFB
Input/Output Ports (PORTS)
Port A
MC68HC08GP8A
Data Sheet
MOTOROLA
Input/Output Ports (PORTS)
121
NOTE:
Avoid glitches on port A pins by writing to the port A data register before changing
data direction register A bits from 0 to 1.
Figure 12-4 shows the port A I/O logic.
Figure 12-4. Port A I/O Circuit
When bit DDRAx is a logic 1, reading address $0000 reads the PTAx data latch.
When bit DDRAx is a logic 0, reading address $0000 reads the voltage level on the
pin. The data latch can always be written, regardless of the state of its data
direction bit. Table 12-2 summarizes the operation of the port A pins.
READ DDRA ($0004)
WRITE DDRA ($0004)
RESET
WRITE PTA ($0000)
READ PTA ($0000)
PTAx
DDRAx
PTAx
INTERNAL
D
AT
A
B
U
S
VDD
PTAPUEx
INTERNAL
PULLUP
DEVICE
Table 12-2. Port A Pin Functions
PTAPUE Bit
DDRA Bit
PTA Bit
I/O Pin Mode
Accesses
to DDRA
Accesses to PTA
Read/Write
Read
Write
10
X(1)
Input, VDD
(4)
DDRA7–DDRA0
Pin
PTA7–PTA0(3)
00
X
Input, Hi-Z(2)
DDRA7–DDRA0
Pin
PTA7–PTA0(3)
X
1
X
Output
DDRA7–DDRA0
PTA7–PTA0
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
4. I/O pin pulled up to VDD by internal pullup device
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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