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HC705P6AGRS/D bảng dữ liệu(PDF) 50 Page - NXP Semiconductors

tên linh kiện HC705P6AGRS/D
Giải thích chi tiết về linh kiện  The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller
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HC705P6AGRS/D bảng dữ liệu(HTML) 50 Page - NXP Semiconductors

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Input/Output Ports
General Release Specification
MC68HC705P6A — Rev. 1.0
Input/Output Ports
6.3 Port A
Port A is an 8-bit bidirectional port, which does not share any of its pins
with other subsystems (see Figure 6-1). The port A data register is
located at address $0000 and its data direction register (DDR) is located
at address $0004. The contents of the port A data register are
indeterminate at initial power up and must be initialized by user software.
Reset does not affect the data registers, but does clear the DDRs,
thereby setting all of the port pins to input mode. Writing a one to a DDR
bit sets the corresponding port pin to output mode. Port A has mask
option register enabled interrupt capability with an internal pullup device
NOTE:
The keyscan (pullup/interrupt) feature available on port A is NOT
available in the ROM device, MC68HC05P6.
Figure 6-1. Port A I/O and Interrupt Circuitry
READ $0000
WRITE $0000
READ $0004
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0004
DATA DIRECTION
REGISTER BIT
TO IRQ
INTERRUPT SYSTEM
VDD
PULLUP MASK
OPTION REGISTER
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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