參數(shù)資料
型號： MC68HC05C8MB
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, PDIP42
封裝： PLASTIC, SHRINK, DIP-42
文件頁數(shù)： 107/156頁
文件大?。?/td> 1755K
代理商： MC68HC05C8MB
Input/Output (I/O) Ports
Advance Information
MC68HC05C8A — Rev. 4.0
54
Input/Output (I/O) Ports
MOTOROLA
7.3 Port A
Port A is an 8-bit bidirectional port which does not share any of its pins
with other subsystems. The port A data register is at $0000 and the data
direction register (DDR) is at $0004. Reset does not affect the data
registers, but clears the data direction registers, thereby returning the
ports to inputs. Writing a 1 to a DDR bit sets the corresponding port bit
to output mode.
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 1 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 1 to prevent
an interrupt from occurring.
Figure 7-1. Port B Pullup Option
PB0
VDD
DDR BIT
NORMAL PORT CIRCUITRY
AS SHOWN IN
FROM ALL OTHER PORT B PINS
IRQ
SCHMITT
TRIGGER
TO INTERRUPT
LOGIC
MASK OPTION
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