參數(shù)資料
型號: MC68HC05J1ACDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 90/128頁
文件大小: 1279K
代理商: MC68HC05J1ACDW
Technical Data
MC68HC05J1A — Rev. 3.0
64
Parallel Input/Output (I/O)
MOTOROLA
Parallel Input/Output (I/O)
7.4.3 Pulldown Register A
All port A pins have mask-optional, programmable pulldown devices that
typically sink 100
A. Clearing the PDIA7–PDIA0 bits in pulldown
register A (PDRA) turns on the pulldown devices. See Figure 7-3.
Pulldown register A can turn on a port A pulldown device only when the
port A pin is an input. Reset clears the PDIA7–PDIA0 bits, turning on all
the port A pulldown devices.
PDIA7–PDIA0 — Port A Pulldown Inhibit Bits
Writing logic 0s to these write-only bits turns on the port A pulldown
devices. Reading pulldown register A returns undefined data.
1 = Corresponding port A pin pulldown device turned off
0 = Corresponding port A pin pulldown device turned on
NOTE:
Avoid a floating port A input by clearing its pulldown register bit before
changing its DDRA bit from logic 1 to logic 0.
Do not use read-modify-write instructions on pulldown register A.
Address:
$0010
Bit 7
6
54321
Bit 0
Read:
Write:
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
Reset:
00
000000
= Unimplemented
Figure 7-3. Pulldown Register A (PDRA)
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