參數(shù)資料
型號(hào): MCV14AI/P
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP14
封裝: 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-14
文件頁(yè)數(shù): 20/84頁(yè)
文件大?。?/td> 1007K
代理商: MCV14AI/P
2009 Microchip Technology Inc.
Preliminary
DS41338B-page 25
MCV14A
5.4
I/O Interfacing
The equivalent circuit for an I/O port pin is shown in
Figure 5-1. All port pins, except RB3 which is input only,
may be used for both input and output operations. For
input operations, these ports are non-latching. Any
input must be present until read by an input instruction
(e.g., MOVF PORTB, W). The outputs are latched and
remain unchanged until the output latch is rewritten. To
use a port pin as output, the corresponding direction
control bit in TRIS must be cleared (= 0). For use as an
input, the corresponding TRIS bit must be set. Any I/O
pin (except RB3) can be programmed individually as
input or output.
FIGURE 5-1:
MCV14A EQUIVALENT
CIRCUIT FOR A SINGLE
I/O PIN
Data
Bus
Q
D
Q
CK
Q
D
Q
CK
P
N
WR
Port
TRIS
‘f’
Data
TRIS
RD Port
VSS
VDD
I/O
pin
W
Reg
Latch
Reset
VSS
VDD
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