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參數(shù)資料
型號: MC68HCL05C8A
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 50/156頁
文件大小: 755K
代理商: MC68HCL05C8A
L
G
R
Input/Output (I/O) Ports
General Release Specification
MC68HC05C8A
Rev. 3.0
50
Input/Output (I/O) Ports
MOTOROLA
7.4 Port B
Port B is an 8-bit bidirectional port. The port B data register is at $0001
and the data direction register (DDR) is at $0005. Reset does not affect
the data registers, but clears the data direction registers, thereby
returning the ports to inputs. Writing a one to a DDR bit sets the
corresponding port pin to output mode. Each of the port B pins has a
mask programmable interrupt capability. This interrupt option also
enables a pullup device when the pin is configured as an input (see
Figure 7-1
). The edge or edge and level sensitivity of the IRQ pin also
will pertain to the enabled port B pins via mask options. Be careful when
using port B pins that have the pullup enabled. Before switching from an
output to an input, the data should be preconditioned to a one to prevent
an interrupt from occurring.
Figure 7-1. Port B Pullup Option
7.5 Port C
Port C is an 8-bit bidirectional port. The port C data register is at $0002
and the data direction register (DDR) is at $0006. Reset does not affect
the data registers, but clears the data direction registers, thereby
returning the ports to inputs. Writing a one to a DDR bit sets the
corresponding port bit to output mode. PC7 has a high current sink and
source capability.
PB0
V
DD
V
DD
DDR BIT
NORMAL PORT CIRCUITRY
AS SHOWN IN
FIGURE 7-2
FROMALL OTHER PORT B PINS
IRQ
SCHMITT
TRIGGER
TO INTERRUPT
LOGIC
MASK OPTION
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