參數(shù)資料
型號: MC68HC705K1
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 68/140頁
文件大?。?/td> 803K
代理商: MC68HC705K1
Technical Data
MC68HC705K1 — Rev. 2.0
Parallel Input/Output (I/O)
For More Information On This Product,
Go to: www.freescale.com
Parallel Input/Output (I/O)
When a port A pin is programmed as an output, reading the port bit
actually reads the value of the data latch and not the voltage on the pin
itself. When a port A pin is programmed as an input, reading the port bit
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction register bit.
Table 7-1
summarizes the operations of the port A pins.
7.5 Port B
Port B is a 2-bit, general-purpose, bidirectional I/O port with these
features:
Programmable pulldown devices
Oscillator output for 3-pin resistance-capacitance (RC) oscillator
configuration
7.5.1 Port B Data Register
The port B data register (PORTB) contains a bit for each of the port B
pins. When a port B pin is programmed to be an output, the state of its
data register bit determines the state of the output pin. When a port B pin
Table 7-1. Port A Pin Functions
Pulldown
Mask
Option
Control Bits
I/O Pin
Mode
Accesses
to PDRA
Accesses
to DDRA
Accesses
to PORTA
PDIAx
DDRAx
Read
Write
Read/Write
Read
Write
No
X
(1)
0
Input, hi-z
U
(2)
PDIA7–PDIA0
DDRA7–DDRA0
Pin
PA7–PA0
No
X
1
Output
U
PDIA7–PDIA0
DDRA7–DDRA0
PA7-PA0
PA7–PA0
Yes
0
0
Input,
pulldown on
U
PDIA7–PDIA0
DDRA7–DDRA0
Pin
PA7–PA0
Yes
0
1
Output
U
PDIA7–PDIA0
DDRA7–DDRA0
PA7-PA0
PA7–PA0
Yes
1
0
Input, hi-z
U
PDIA7–PDIA0
DDRA7–DDRA0
Pin
PA7–PA0
Yes
1
1
Output
U
PDIA7–PDIA0
DDRA7–DDRA0
PA7-PA0
PA7–PA0
1. X = Don’t care
2. U = Undefined
F
Freescale Semiconductor, Inc.
n
.
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