參數(shù)資料
型號: Q67121C452
英文描述: IC-SM-8-BIT CPU-12MHZ
中文描述: 集成電路釤8位CPU - 12MHz的
文件頁數(shù): 12/121頁
文件大?。?/td> 1000K
代理商: Q67121C452
Semiconductor Group
1-6
Introduction
C501
1.2
Pin Definitions and Functions
This section describes all external signals of the C501 with its function.
Table 1-1
Pin Definitions and Functions
Symbol
Pin Number
I/O*) Function
P-LCC-44 P-DIP-40 P-MQFP-44
P1.0 – P1.7 2–9
2
3
1–8
1
2
40–44,
1–3,
40
41
I/O
Port 1
is a quasi-bidirectional I/O port with
internal pull-up resistors. Port 1 pins that
have 1s written to them are pulled high by
the internal pullup resistors, and in that
state can be used as inputs. As inputs,
port 1 pins being externally pulled low will
source current (
I
IL
, in the DC character-
istics) because of the internal pull-up
resistors. Port 1 also contains the timer 2
pins as secondary function. The output
latch corresponding to a secondary
function must be pro-grammed to a one
(1) for that function to operate.
The secondary functions are assigned to
the pins of port 1, as follows:
P1.0
T2
Input to counter 2
P1.1
T2EX Capture - Reload trigger of
timer 2 / Up-Down count
*) I
= Input
O = Output
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