參數(shù)資料
型號: ST72T774S9T1
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封裝: TQFP-44
文件頁數(shù): 65/144頁
文件大小: 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
27/144
4 ON-CHIP PERIPHERALS
4.1 I/O PORTS
4.1.1 Introduction
The I/O ports allow the transfer of data through
digital inputs and outputs, and, for specific pins,
the input of analog signals or the Input/Output of
alternate signals for on-chip peripherals (DDC,
TIMER...).
Each pin can be programmed independently as
digital input or digital output. Each pin can be an
analog input when an analog switch is connected
to the Analog to Digital Converter (ADC).
Figure 15. I/O Pin Typical Circuit
Note: This is the typical I/O pin configuration. For cost optimization, each port is customized with a specific configuration.
DR
DDR
latch
D
a
ta
B
u
s
DR SEL
DDR SEL
VDD
PAD
Analog
Switch (if required)
Analog Enable
(ADC)
Alternate enable
Alternate Enable
Digital Enable
Alternate enable
Com
m
on
A
n
a
log
Rai
l
Alternate
Alternate Input
PULL-UP (if required)
output
P-BUFFER
(if required)
N-BUFFER
1
0
1
0
VSS
5
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