參數(shù)資料
型號(hào)： MC68HC705J5A
廠(chǎng)商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： 8-bit microcontroller units
中文描述： 8位微控制器單元
文件頁(yè)數(shù)： 45/106頁(yè)
文件大小： 670K
代理商： MC68HC705J5A
July 16, 1999
GENERAL RELEASE SPECIFICATION
INPUT/OUTPUT PORTS
REV 2.1
7-1
SECTION 7
INPUT/OUTPUT PORTS
In the normal operating mode there are 14 usable bidirectional I/O lines arranged
as one 8-bit I/O port (Port A), and one 6-bit I/O port (Port B). The individual bits in
these ports are programmable as either inputs or outputs under software control
by the data direction registers (DDR’s). Also, if enabled by a single mask option all
Port A and Port B I/O pins may have individual software programmable pull-down
or pull-up devices. Also, PA4-PA7 and PB1-PB2 pins have high current sink capa-
bility; PA0-PA3 may function as additional IRQ interrupt input sources. Note that
both PA6 and PA7 pins have Schmitt trigger input for better noise immunity. V
and V
IL
specified at 2.4V and 0.8V, respectively.
The four port pins, PB2-PB5 are only available on the 20-pin version of the device.
7.1
SLOW OUTPUT FALLING-EDGE TRANSITION
Figure 7-1. Port B Data Direction Register
SLOWE - Slow Transition Enable
The slow transition feature is controlled by the SLOWE bit of DDRB (Port B
Data Direction Register).
1 =
Enables the slow falling-edge output transition feature on the four I/
O lines: PA6, PA7, PB1, and PB2. If the pin is configured as an
output pin.
0 =
Disables slow falling-edge output transition feature on the four I/O
lines: PA6, PA7, PB1, and PB2. Default value of SLOWE bit is
cleared.
7.2
PORT A
Port A is a 8-bit bidirectional port which shares five of its pins with the IRQ inter-
rupt system as shown in
Figure 7-2
. Note that both PA6 and PA7 pins have
Schmitt trigger input for better noise immunity. Only the PA6 and PA7 pins are
open-drained type with slow output transition feature.
0
DDRB0
DDRB
$0005
0
7
W
R
0
0
0
0
0
0
0
reset
6
5
4
3
2
1
0
SLOWE
DDRB1
DDRB2
DDRB3
DDRB4
DDRB5
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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