参数资料
型号: PIC17C44
元件分类: 外设及接口
英文描述: Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C
中文描述: 电可擦除可编程逻辑器件
文件页数: 50/71页
文件大小: 1173K
代理商: PIC17C44
PIC17C4X
DS30412C-page 54
1996 Microchip Technology Inc.
FIGURE 9-2:
RA2 AND RA3 BLOCK
DIAGRAM
Note: I/O pins have protection diodes to VSS.
Data Bus
WR_PORTA
(Q4)
QD
Q
CK
RD_PORTA
(Q2)
FIGURE 9-3:
RA4 AND RA5 BLOCK
DIAGRAM
Note: I/O pins have protection diodes to VDD and VSS.
Data Bus
RD_PORTA
(Q2)
Serial port output signals
Serial port input signal
OE = SPEN,SYNC,TXEN, CREN, SREN for RA4
OE = SPEN (SYNC+SYNC,CSRC) for RA5
TABLE 9-1:
PORTA FUNCTIONS
TABLE 9-2:
REGISTERS/BITS ASSOCIATED WITH PORTA
Name
Bit0
Buffer Type
Function
RA0/INT
bit0
ST
Input or external interrupt input.
RA1/T0CKI
bit1
ST
Input or clock input to the TMR0 timer/counter, and/or an external interrupt input.
RA2
bit2
ST
Input/Output. Output is open drain type.
RA3
bit3
ST
Input/Output. Output is open drain type.
RA4/RX/DT
bit4
ST
Input or USART Asynchronous Receive or USART Synchronous Data.
RA5/TX/CK
bit5
ST
Input or USART Asynchronous Transmit or USART Synchronous Clock.
RBPU
bit7
Control bit for PORTB weak pull-ups.
Legend: ST = Schmitt Trigger input.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
(Note1)
10h, Bank 0
PORTA
RBPU
RA5
RA4
RA3
RA2
RA1/T0CKI
RA0/INT
0-xx xxxx
0-uu uuuu
05h, Unbanked
T0STA
INTEDG
T0SE
T0CS
PS3
PS2
PS1
PS0
0000 000-
13h, Bank 0
RCSTA
SPEN
RC9
SREN
CREN
FERR
OERR
RC9D
0000 -00x
0000 -00u
15h, Bank 0
TXSTA
CSRC
TX9
TXEN
SYNC
TRMT
TX9D
0000 --1x
0000 --1u
Legend: x = unknown, u = unchanged, - = unimplemented reads as '0'. Shaded cells are not used by PORTA.
Note 1:
Other (non power-up) resets include: external reset through MCLR and the Watchdog Timer Reset.
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