參數(shù)資料
型號(hào)： MCP1631RD-DCPC1
廠商： Microchip Technology
文件頁數(shù)： 27/44頁
文件大?。?/td> 0K
描述： REF DES BATT CHARG OR LED DRIVER
標(biāo)準(zhǔn)包裝： 1
電流 - 輸出 / 通道： 700mA
輸出及類型： 1，非隔離
特點(diǎn)： 用于鋰離子、鎳氫和鎳鎘電池充電器的固件
輸入電壓： 3.5 ~ 16 V
已供物品： 板
已用 IC / 零件： MCP1631HV，PIC16F616
產(chǎn)品目錄頁面： 668 (CN2011-ZH PDF)
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2009 Microchip Technology Inc.
DS41288F-page 33
PIC16F610/616/16HV610/616
4.0
I/O PORTS
There are as many as eleven general purpose I/O pins
and an input pin available. Depending on which
peripherals are enabled, some or all of the pins may not
be available as general purpose I/O. In general, when a
peripheral is enabled, the associated pin may not be
used as a general purpose I/O pin.
4.1
PORTA and the TRISA Registers
PORTA is a 6-bit wide, bidirectional port. The
corresponding
data
direction
register
is
TRISA
(Register 4-2). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables output
driver and puts the contents of the output latch on the
selected pin). The exception is RA3, which is input only
and its TRIS bit will always read as ‘1’. Example 4-1
shows how to initialize PORTA.
Reading the PORTA register (Register 4-1) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then
written to the PORT data latch. RA3 reads ‘0’ when
MCLRE = 1.
The TRISA register controls the direction of the
PORTA pins, even when they are being used as
analog inputs. The user must ensure the bits in the
TRISA register are maintained set when using them as
analog inputs. I/O pins configured as analog input
always read ‘0’.
EXAMPLE 4-1:
INITIALIZING PORTA
Note:
The ANSEL register must be initialized to
configure an analog channel as a digital
input. Pins configured as analog inputs will
read ‘0’ and cannot generate an interrupt.
BCF
STATUS,RP0
;Bank 0
CLRF
PORTA
;Init PORTA
BSF
STATUS,RP0
;Bank 1
CLRF
ANSEL
;digital I/O
MOVLW
0Ch
;Set RA<3:2> as inputs
MOVWF
TRISA
;and set RA<5:4,1:0>
;as outputs
BCF
STATUS,RP0
;Bank 0
REGISTER 4-1:
PORTA: PORTA REGISTER
U-0
R/W-x
R/W-0
R-x
R/W-0
—
RA5
RA4
RA3
RA2
RA1
RA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
RA<5:0>: PORTA I/O Pin bit
1
= PORTA pin is > VIH
0
= PORTA pin is < VIL
REGISTER 4-2:
TRISA: PORTA TRI-STATE REGISTER
U-0
R/W-1
R-1
R/W-1
—
TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
Unimplemented: Read as ‘0’
bit 5-0
TRISA<5:0>: PORTA Tri-State Control bit
1
= PORTA pin configured as an input (tri-stated)
0
= PORTA pin configured as an output
Note
1:
TRISA<3> always reads ‘1’.
2:
TRISA<5:4> always reads ‘1’ in XT, HS and LP Oscillator modes.
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