參數(shù)資料
型號(hào): MC68HC705JJ7S
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封裝: WINDOWED, CERAMIC, DIP-20
文件頁數(shù): 116/164頁
文件大?。?/td> 1165K
代理商: MC68HC705JJ7S
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
55
Chapter 7
Parallel Input/Output
7.1 Introduction
The MC68HC705JJ7 has 14 bidirectional input/output (I/O) pins which form two parallel I/O ports, A
and B. The MC68HC705JP7 has 22 bidirectional I/O pins which form three parallel I/O ports, A, B and C.
Each I/O pin is programmable as an input or an output. The contents of the data direction registers
determine the data direction of each of the I/O pins. All I/O pins have software programmable pulldown
devices which can be enabled or disabled globally by the SWPDI bit in the mask option register (MOR).
7.2 Port A
Port A is a 6-bit, general-purpose, bidirectional I/O port with these features:
Individual programmable pulldown devices
High current sinking capability on all port A pins, with a maximum total for port A
High current sourcing capability on all port A pins, with a maximum total for port A
External interrupt capability (pins PA3–PA0)
7.2.1 Port A Data Register
The port A data register (PORTA) contains a bit for each of the port A pins. When a port A pin is
programmed to be an output, the state of its data register bit determines the state of the output pin. When
a port A pin is programmed to be an input, reading the port A data register returns the logic state of the
pin. The upper two bits of the port A data register will always read as logic 0s.
PA5–PA0 — Port A Data Bits
These read/write bits are software programmable. Data direction of each bit is under the control of the
corresponding bit in the port A data direction register (DDRA). Reset has no effect on port A data.
Address:
$0000
Bit 7
654321
Bit 0
Read:
0
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
Alternate:
KYBD3
KYBD2
KYBD1
KYBD0
= Unimplemented
Figure 7-1. Port A Data Register (PORTA)
相關(guān)PDF資料
PDF描述
MC68HC705K1DWR2 8-BIT, OTPROM, MICROCONTROLLER, PDSO16
MC68HC705K1CP 8-BIT, OTPROM, MICROCONTROLLER, PDIP16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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