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参数资料
型号： KSZ8864RMN-EVAL
厂商： Micrel Inc
文件页数： 41/111页
文件大小： 0K
描述： BOARD EVALUATION FOR KSZ8864RMN
标准包装： 1
主要目的： 接口，以太网控制器（PHY 和 MAC）
嵌入式： 否
已用 IC / 零件： KSZ8864RMN
已供物品： 板
相关产品： 576-3787-ND - IC ETHERNET SW 4PORT 64QFN
其它名称： 576-3869
1997 Microchip Technology Inc.
DS30444E - page 35
PIC16C9XX
5.3
PORTC and TRISC Register
PORTC is an 6-bit bi-directional port. Each pin is indi-
vidually congurable as an input or output through the
TRISC register. PORTC is multiplexed with several
peripheral functions (Table 5-5). 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-mod-
ify-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 5-3:
INITIALIZING PORTC
BCF
STATUS,RP0 ; Select Bank0
BCF
STATUS,RP1
CLRF
PORTC
; Initialize PORTC
BSF
STATUS,RP0 ;
MOVLW
0xCF
; Value used to
; initialize data
; direction
MOVWF
TRISC
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> always read 0
FIGURE 5-5:
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE)
Data Latch
RBPU(2)
P
VDD
Q
D
CK
Q
D
CK
Q
D
EN
Data bus
WR Port
WR TRIS
RD TRIS
RD Port
weak
pull-up
RD Port
RB0/INT
I/O
pin(1)
TTL
Input
Buffer
Note 1: I/O pins have diode protection to VDD and VSS.
2: To enable weak pull-ups, set the appropriate TRIS bit(s)
and clear the RBPU bit (OPTION<7>).
Schmitt Trigger
Buffer
TRIS Latch
TABLE 5-5: PORTC FUNCTIONS
TABLE 5-6: SUMMARY OF REGISTERS ASSOCIATED WITH PORTC
Name
Bit#
Buffer Type
Function
RC0/T1OSO/T1CKI
bit0
ST
Input/output port pin or Timer1 oscillator output or Timer1 clock input
RC1/T1OSI
bit1
ST
Input/output port pin or Timer1 oscillator input
RC2/CCP1
bit2
ST
Input/output port pin or Capture input/Compare output/PWM output
RC3/SCK/SCL
bit3
ST
Input/output port pin or the synchronous serial clock for both SPI and
I2C modes.
RC4/SDI/SDA
bit4
ST
Input/output port pin or the SPI Data In (SPI mode) or data I/O (I2C
mode).
RC5/SDO
bit5
ST
Input/output port pin or Synchronous Serial Port data out
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
07h
PORTC
—
RC5
RC4
RC3
RC2
RC1
RC0
--xx xxxx
--uu uuuu
87h
TRISC
—
PORTC Data Direction Control Register
--11 1111
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PORTC.
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