參數(shù)資料
型號(hào)： KSZ8863FLL-EVAL
廠商： Micrel Inc
文件頁數(shù)： 24/106頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR KSZ8863FLL
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，以太網(wǎng) PHY
嵌入式： 否
已用 IC / 零件： KSZ8863FLL
已供物品： 板
相關(guān)產(chǎn)品： 576-3750-ND - IC ETHERNET SWITCH 3PORT 48-LQFP
576-3576-ND - IC ETHERNET SW 3PORT 48-LQFP
其它名稱： 576-3866
PIC16C72 Series
1998 Microchip Technology Inc.
Preliminary
DS39016A-page 23
3.3
PORTC and the TRISC Register
PORTC is an 8-bit wide bi-directional port. The corre-
sponding data direction register is TRISC. Setting a
TRISC bit (=1) will make the corresponding PORTC pin
an input, i.e., put the corresponding output driver in a
hi-impedance mode. Clearing a TRISC bit (=0) will
make the corresponding PORTC pin an output, i.e., put
the contents of the output latch on the selected pin.
PORTC is multiplexed with several peripheral functions
(Table 3-5). PORTC pins have Schmitt Trigger input
buffers.
When enabling peripheral functions, care should be
taken in dening TRIS bits for each PORTC pin. Some
peripherals override the TRIS bit to make a pin an out-
put, while other peripherals override the TRIS bit to
make a pin an input. Since the TRIS bit override is in
effect while the peripheral is enabled, read-modify-
write instructions (BSF, BCF, XORWF) with TRISC as
destination should be avoided. The user should refer to
the corresponding peripheral section for the correct
TRIS bit settings.
EXAMPLE 3-1:
INITIALIZING PORTC
BCF
STATUS, RP0
; Select Bank 0
CLRF
PORTC
; Initialize PORTC by
; clearing output
; data latches
BSF
STATUS, RP0
; Select Bank 1
MOVLW
0xCF
; Value used to
; initialize data
; direction
MOVWF
TRISC
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> as inputs
FIGURE 3-5:
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE)
PORT/PERIPHERAL Select(2)
Data bus
WR
PORT
WR
TRIS
RD
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Q
D
Q
CK
Q
D
EN
Peripheral Data Out
0
1
Q
D
Q
CK
P
N
VDD
VSS
PORT
Peripheral
OE(3)
Peripheral input
I/O
pin(1)
Note 1:
I/O pins have diode protection to VDD and VSS.
2:
Port/Peripheral select signal selects between port
data and peripheral output.
3:
Peripheral OE (output enable) is only activated if
peripheral select is active.
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