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M68ICS08GR bảng dữ liệu(PDF) 227 Page - Freescale Semiconductor, Inc

tên linh kiện M68ICS08GR
Giải thích chi tiết về linh kiện  M68HC08 Microcontrollers
PDF  408 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR bảng dữ liệu(HTML) 227 Page - Freescale Semiconductor, Inc

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Input/Output Ports (I/O)
Port E
MC68HC908GR8 — Rev 4.0
Technical Data
MOTOROLA
Input/Output Ports (I/O)
227
Figure 16-19. Port E I/O Circuit
When bit DDREx is a logic 1, reading address $0008 reads the PTEx
data latch. When bit DDREx is a logic 0, reading address $0008 reads
the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 16-6 summarizes
the operation of the port E pins.
READ DDRE ($000C)
WRITE DDRE ($000C)
RESET
WRITE PTE ($0008)
READ PTE ($0008)
PTEx
DDREx
PTEx
Table 16-6. 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)
Input, Hi-Z(2)
DDRE1–DDRE0
Pin
PTE1–PTE0(3)
1
X
Output
DDRE1–DDRE0]
PTE1–PTE0
PTE1–PTE0
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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