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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 27/126頁(yè) |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8ACFB |
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Input/Output Ports (PORTS)
Data Sheet
MC68HC08GP8A
122
Input/Output Ports (PORTS)
MOTOROLA
12.2.3 Port A Input Pullup Enable Register
The port A input pullup enable register (PTAPUE) contains a software configurable
pullup device for each of the eight port A pins. Each bit is individually configurable
and requires that the data direction register, DDRA, bit be configured as an input.
Each pullup is automatically and dynamically disabled when a port bit’s DDRA is
configured for output mode.
PTAPUE7–PTAPUE0 — Port A Input Pullup Enable Bits
These writable bits are software programmable to enable pullup devices on an
input port bit.
1 = Corresponding port A pin configured to have internal pullup
0 = Corresponding port A pin has internal pullup disconnected
12.3 Port B
Port B is an 8-bit special-function port that shares all eight of its pins with the
analog-to-digital converter (ADC) module.
12.3.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the eight port pins.
PTB7–PTB0 — Port B Data Bits
These read/write bits are software-programmable. Data direction of each port B
pin is under the control of the corresponding bit in data direction register B.
Reset has no effect on port B data.
AD7–AD0 — Analog-to-Digital Input Bits
AD7–AD0 are pins used for the input channels to the analog-to-digital converter
module. The channel select bits in the ADC status and control register define
Address:
$000D
Bit 7
654321
Bit 0
Read:
PTAPUE7
PTAPUE6
PTAPUE5
PTAPUE4
PTAPUE3
PTAPUE2
PTAPUE1
PTAPUE0
Write:
Reset:
00000000
Figure 12-5. Port A Input Pullup Enable Register (PTAPUE)
Address:
$0001
Bit 7
654321
Bit 0
Read:
PTB7
PTB6
PTB5
PTB4
PTB3
PTB2
PTB1
PTB0
Write:
Reset:
Unaffected by reset
Alternate
Function:
AD7AD6
AD5AD4AD3AD2AD1AD0
Figure 12-6. Port B Data Register (PTB)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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