參數(shù)資料
型號: MC68HC08QY2VDTE
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, PDSO16
封裝: 0.65 MM PITCH, LEAD FREE, TSSOP-16
文件頁數(shù): 3/176頁
文件大?。?/td> 1124K
代理商: MC68HC08QY2VDTE
Input/Output Ports (PORTS)
MC68HC08QY/QT Family Data Sheet, Rev. 2
100
Freescale Semiconductor
12.3.4 Port A Summary Table
The following table summarizes the operation of the port A pins when used as a general-purpose
input/output pins.
12.4 Port B
Port B is an 8-bit special function port that shares two of its pins with the 10-bit ADC (see Chapter 3 10-Bit
Each port B pin also has a software configurable pullup device if the corresponding port pin is configured
as an input port.
12.4.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the 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
Bit 76
5
4
3
2
1Bit 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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