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M68HC05 Datasheet(PDF) 64 Page - Freescale Semiconductor, Inc

Part # M68HC05
Description  Microcontrollers
PDF  128 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68HC05 Datasheet(HTML) 64 Page - Freescale Semiconductor, Inc

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Technical Data
MC68HC05J1A — Rev. 3.0
Parallel Input/Output (I/O)
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
µA. 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)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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