參數(shù)資料
型號: MC68HC08LT8CFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù): 8/156頁
文件大?。?/td> 1107K
代理商: MC68HC08LT8CFGE
Port E
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
105
Figure 9-17. Port E I/O Circuit
When DDREx is a logic 1, reading address $0009 reads the PTEx data latch. When DDREx is a logic 0,
reading address $0009 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
Table 9-5 summarizes the operation of the port E pins.
Table 9-6. Port E Pin Functions
DDRE
Bit
PTE Bit
I/O Pin Mode
Accesses to DDRE
Accesses to PTE
Read/Write
Read
Write
0
X(1)
1. X = don’t care; except.
Input, Hi-Z(2)
2. Hi-Z = high impedance.
DDRE[7:0]
Pin
PTE[7:0](3)
3. Writing affects data register, but does not affect input.
1
X
Output
DDRE[7:0]
PTE[7:0]
READ DDRE ($0008)
WRITE DDRE ($0008)
RESET
WRITE PTE ($0009)
READ PTE ($0009)
PTEx
DDREx
PTEx
INTERN
AL
D
AT
A
B
U
S
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