參數(shù)資料
型號： C509-L
廠商： INFINEON TECHNOLOGIES AG
元件分類： 8位微控制器
英文描述： 8-Bit CMOS Microcontroller
中文描述： 8位CMOS微控制器
文件頁數(shù)： 13/74頁
文件大小： 1607K
代理商： C509-L
C509-L
Semiconductor Group
12
P3.0 – P3.7
90-97
90
91
92
93
94
95
96
97
I/O
Port 3
is an 8-bit quasi-bidirectional I/O port with internal pullup
resistors. Port 3 pins that have 1's written to them are
pulled high by the internal pullup resistors, and in that
state can be used as inputs. As inputs, port 3 pins being
externally pulled low will source current (
I
IL
, in the DC
characteristics) because of the internal pullup resistors.
Port 3 also contains two external interrupt inputs, the
timer 0/1 inputs, the serial port 0 receive/transmit line
and the external memory strobe pins. The output latch
corresponding to a secondary function must be
programmed to a one (1) for that function to operate.
The secondary functions are assigned to the port pins of
port 3 as follows
P3.0
R
×
D0
Receiver data input (asynchronous) or
data input/output (synchronous) of serial
interface 0
P3.1
T
×
D0
Transmitter data output (asynchronous)
or clock output (synchronous) of the
serial interface 0
P3.2
INT0
Interrupt 0 input / timer 0 gate control
P3.3
INT1
Interrupt 1 input / timer 1 gate control
P3.4
T0
Counter 0 input
P3.5
T1
Counter 1 input
P3.6
WR
The write control signal latches the data
byte from port 0 into the external data
memory
P3.7
RD /
The read control signal enables the
external data memory to port 0
PSENX PSENX (external program store enable)
enables the external code memory
when the external / internal XRAM
mode or external / internal programming
mode is selected.
V
SS
V
CC
10, 28, 62, 88
–
Circuit ground potential
11, 29, 63, 89
–
Supply terminal
for all operating modes
*) I = Input
O = Output
Table 1
Pin Definitions and Functions (cont’d)
Symbol
Pin Number
I/O*)
Function
相關PDF資料
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