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參數(shù)資料
| 型號： | MC908QT4VDWE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數(shù)： | 3/184頁 |
| 文件大?。?/td> | 1659K |
| 代理商： | MC908QT4VDWE |
Input/Output Ports (PORTS)
MC68HC908QY/QT Family Data Sheet, Rev. 6
100
Freescale Semiconductor
PTAPUE[5:0] — Port A Input Pullup Enable Bits
These read/write bits are software programmable to enable pullup devices on port A pins.
1 = Corresponding port A pin configured to have internal pull if its DDRA bit is set to 0
0 = Pullup device is disconnected on the corresponding port A pin regardless of the state of its
DDRA bit
Table 12-1 summarizes the operation of the port A pins.
12.3 Port B
Port B is an 8-bit general purpose I/O port. Port B is only available on the MC68HC908QY1,
MC68HC908QY2, and MC68HC908QY4.
12.3.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the eight port B pins.
PTB[7:0] — 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.
Table 12-1. 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)
1. X = don’t care
Input, VDD
(2)
2. I/O pin pulled to VDD by internal pullup.
DDRA5–DDRA0
Pin
PTA5–PTA0(3)
3. Writing affects data register, but does not affect input.
00
X
Input, Hi-Z(4)
4. Hi-Z = high impedance
DDRA5–DDRA0
Pin
PTA5–PTA0(3)
X
1
X
Output
DDRA5–DDRA0
PTA5–PTA0
PTA5–PTA0(5)
5. Output does not apply to PTA2
Address: $0001
Bit 7
6
543
21
Bit 0
Read:
PTB7
PTB6
PTB5
PTB4
PTB3
PTB2
PTB1
PTB0
Write:
Reset:
Unaffected by reset
Figure 12-5. Port B Data Register (PTB)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC908QT4VDWR2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述: |
| MC908QT4VFQE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
| MC908QT4VPE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
| MC908QVY4CDWER | 制造商:Freescale Semiconductor 功能描述:3V NITRON LOFT |
| MC908QY1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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