參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 113/165頁
文件大小: 841K
代理商: MC68HC705PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
INPUT/OUTPUT PORTS
MOTOROLA
REV 1.1
7-1
SECTION 7
INPUT/OUTPUT PORTS
The MC68HC05PD6 a has 8 parallel ports A, B, C, D, E, F, G and H. Port A, B, C,
F, G and H have 8 I/O pins, Port D and E have 8 output-only pins. The individual
bits in these ports are programmable as either inputs or outputs under software
control by the data direction registers (DDRs). All of these pins except Port A
serve multiple purposes depending on the conguration of these pins.
7.1
PORT A
Port A is an 8-bit bidirectional general purpose port. The data direction of a Port A
pin is determined by its corresponding DDRA bit.
When a Port A pin is programmed as an output by the corresponding DDRA bit,
data in the PORTA data register becomes output data to the pin and this data is
returned when PORTA register is read.
Open drain or CMOS outputs are selected by AWOMH and AWOML bits in the
WOM1 register. If the AWOMH bit is set, the P-channel drivers of output buffers of
bit 7 thru bit 4 are disabled (open drain). If the AWOML bit is set, the P-channel
drivers of output buffers of bit 3 thru bit 0 are disabled (open drain).
When a pin is programmed as input by the corresponding DDRA bit, the pin level
is read by the CPU.
Port A has an optional pull-up resistors. When the RAH or RAL bit in the RCR1 is
set, pull-up resistors are attached to the upper 4 bits or lower 4 bits of Port A pins,
respectively. (The typical resistor values are 200K
at V
DD=3V.) When a pin
outputs a low level, the pull-up resistor is disconnected regardless of RAH or RAL
bit state.
7.2
PORT B
Port B pins serve two basic functions: Key Wake-up Interrupt (KWI) input pins and
general purpose I/O pins.
Each KWI input is enabled or disabled by the corresponding KWIE
x bit in the
KWIEN register, and the usage of the KWI input does not affect the general
purpose input function. When any of these bits is used as Port B I/O, the
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