參數(shù)資料
型號(hào): MC68HC08GP8ACFB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 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(yè)數(shù): 30/126頁(yè)
文件大?。?/td> 4243K
代理商: MC68HC08GP8ACFB
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Input/Output Ports (PORTS)
Port C
MC68HC08GP8A
Data Sheet
MOTOROLA
Input/Output Ports (PORTS)
125
12.4.2 Data Direction Register C
Data direction register C (DDRC) determines whether each port C pin is an input
or an output. Writing a logic 1 to a DDRC bit enables the output buffer for the
corresponding port C pin; a logic 0 disables the output buffer.
DDRC6–DDRC0 — Data Direction Register C Bits
These read/write bits control port C data direction. Reset clears
DDRC6–DDRC0, configuring all port C pins as inputs.
1 = Corresponding port C pin configured as output
0 = Corresponding port C pin configured as input
NOTE:
Avoid glitches on port C pins by writing to the port C data register before changing
data direction register C bits from 0 to 1.
Figure 12-11 shows the port C I/O logic.
NOTE:
For those devices packaged in a 42-pin shrink dual in-line package, PTC5 and
PTC6 are connected to ground internally. DDRC5 and DDRC6 should be set to a 0
to configure PTC5 and PTC6 as inputs.
Figure 12-11. Port C I/O Circuit
Address:
$0006
Bit 7
654321
Bit 0
Read:
0
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
Write:
Reset:
00000000
= Unimplemented
Figure 12-10. Data Direction Register C (DDRC)
READ DDRC ($0006)
WRITE DDRC ($0006)
RESET
WRITE PTC ($0002)
READ PTC ($0002)
PTCx
DDRCx
PTCx
IN
TERNAL
D
AT
A
B
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VDD
PTCPUEx
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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