PIC16C558T-04/SO View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16C558T-04/SO Datasheet PDF : 108 Pages
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PIC16C55X
FIGURE 5-4:
BLOCK DIAGRAM OF RB3:RB0 PINS
RBPU(1)
VDD
Data Bus
WR PORTB
Data Latch
DQ
CK
TRIS Latch
P
weak
pull-up
VDD
VDD
P
I/O
N
pin
WR TRISB
DQ
CK Q
VSS
VSS
TTL
Input
Buffer
ST
Buffer
RD TRISB
Latch
QD
RD PORTB
EN
RB0/INT
ST
Buffer
RD PORTB
Note 1: TRISB = 1 enables weak pull-up if RBPU = ‘0’ (OPTION<7>).
TABLE 5-3: PORTB FUNCTIONS
Name
Bit #
Buffer Type
Function
RB0/INT
Bit 0
TTL/ST(1)
Bi-directional I/O port. Internal software programmable weak pull-up.
RB1
Bit 1
TTL
Bi-directional I/O port. Internal software programmable weak pull-up.
RB2
Bit 2
TTL
Bi-directional I/O port. Internal software programmable weak pull-up.
RB3
Bit 3
TTL
Bi-directional I/O port. Internal software programmable weak pull-up.
RB4
Bit 4
TTL
Bi-directional I/O port (with interrupt-on-change). Internal software programmable
weak pull-up.
RB5
Bit 5
TTL
Bi-directional I/O port (with interrupt-on-change). Internal software programmable
weak pull-up.
RB6
Bit 6
TTL/ST(2)
Bi-directional I/O port (with interrupt-on-change). Internal software programmable
weak pull-up. Serial programming clock pin.
RB7
Bit 7
TTL/ST(2)
Bi-directional I/O port (with interrupt-on-change). Internal software programmable
weak pull-up. Serial programming data pin.
Legend: ST = Schmitt Trigger, TTL = TTL input
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
TABLE 5-4: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB AND TRISB
Address Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
06h
PORTB
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0 xxxx xxxx
86h
TRISB
TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111
81h
OPTION
RBPU
INTEDG T0CS T0SE
PSA
PS2
PS1
PS0 1111 1111
0BH, 8BH INTCON
GIE
Reserved
Legend: x = unknown, u = unchanged
Note 1: Shaded bits are not used by PORTB.
T0IE
INTE
BRIE
T0IF
INTF
RBIF 0000 000x
Value on
All Other
RESETS
uuuu uuuu
1111 1111
1111 1111
0000 000x
DS40143D-page 26
Preliminary
2002 Microchip Technology Inc.
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