參數(shù)資料
型號: Q67120-C1056SAB-C501G-1EP
英文描述: IC-8-BIT CPU
中文描述: 集成電路8位CPU
文件頁數(shù): 13/121頁
文件大?。?/td> 1000K
代理商: Q67120-C1056SAB-C501G-1EP
Introduction
C501
Semiconductor Group
1-7
P3.0 – P3.7 11,
13–19
11
13
14
15
16
17
18
19
10–17
10
11
12
13
14
15
16
17
5, 7–13
5
7
8
9
10
11
12
13
I/O
Port 3
is a quasi-bidirectional I/O port with
internal pull-up resistors. Port 3 pins that
have 1s written to them are pulled high by
the internal pull-up resistors, and in that
state they 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
pull-up resistors. Port 3 also contains the
interrupt, timer, serial port 0 and external
memory strobe pins which are used by
various options. 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 pins of port 3, as follows:
P3.0
R
×
D
receiver data input (asyn-
chronous) or data input
output (synchronous) of
serial interface 0
P3.1
T
×
D
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 lat-
ches 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
*) I
= Input
O = Output
Table 1-1
Pin Definitions and Functions
(cont’d)
Symbol
Pin Number
I/O*) Function
P-LCC-44 P-DIP-40 P-MQFP-44
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