參數(shù)資料
型號： KSZ8864RMNI
廠商： Micrel Inc
文件頁數(shù)： 47/111頁
文件大?。?/td> 0K
描述： IC ETHERNET SWITCH 4PORT 64QFN
特色產(chǎn)品： KSZ8864RMN Ethernet Switches
標(biāo)準(zhǔn)包裝： 348
系列： *
其它名稱： 576-3995
PIC16C9XX
DS30444E - page 40
1997 Microchip Technology Inc.
5.7
PORTG and TRISG Register
PORTG is an digital input only port. Each pin is multi-
plexed with an LCD segment driver. These pins have
Schmitt Trigger input buffers.
EXAMPLE 5-7:
INITIALIZING PORTG
BCF STATUS,RP0
;Select Bank2
BSF STATUS,RP1
;
BCF LCDSE,SE27
;Make all PORTG
BCF LCDSE,SE20
;and PORTE<7>
;digital inputs
Note 1: On a Power-on Reset these pins are con-
gured as LCD segment drivers.
Note 2: To congure the pins as a digital port, the
corresponding bits in the LCDSE register
must be cleared. Any bit set in the LCDSE
register overrides any bit settings in the
corresponding TRIS register.
FIGURE 5-10: PORTG BLOCK DIAGRAM
RD PORT
Schmitt
Trigger
input
buffer
EN
Q
D
EN
Digital Input/
LCDSE<n>
LCD
LCD Segment
LCD Output pin
LCD
LCD Common
Data Bus
RD TRIS
VDD
Segment Data
Output Enable
Common Data
Output Enable
TABLE 5-13: PORTG FUNCTIONS
TABLE 5-14: SUMMARY OF REGISTERS ASSOCIATED WITH PORTG
Name
Bit#
Buffer Type
Function
RG0/SEG20
bit0
ST
Digital input or Segment Driver20
RG1/SEG21
bit1
ST
Digital input or Segment Driver21
RG2/SEG22
bit2
ST
Digital input or Segment Driver22
RG3/SEG23
bit3
ST
Digital input or Segment Driver23
RG4/SEG24
bit4
ST
Digital input or Segment Driver24
RG5/SEG25
bit5
ST
Digital input or Segment Driver25
RG6/SEG26
bit6
ST
Digital input or Segment Driver26
RG7/SEG28
bit7
ST
Digital input or Segment Driver28 (not available on 64-pin devices)
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
108h
PORTG
RG7
RG6
RG5
RG4
RG3
RG2
RG1
RG0
0000 0000
188h
TRISG
PORTG Data Direction Control Register
1111 1111
10Dh
LCDSE
SE29
SE27
SE20
SE16
SE12
SE9
SE5
SE0
1111 1111
Legend: Shaded cells are not used by PORTG.
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