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| PIC16F87 Datasheet, PDF (63/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology | |||
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FIGURE 5-10:
BLOCK DIAGRAM OF RB2 PIN
SSPEN
SDO
1
0
PIC16F87/88
RBPU(2)
SPEN
DT
1
0
Data Bus
WR PORTB
Data Latch
DQ
CK
WR TRISB
DT Drive
TRIS Latch
D
Q
CK Q
RD TRISB
RD PORTB
RX/DT
Schmitt Trigger
Buffer
SSPEN + SPEN
VDD
P
Weak
Pull-up
VDD
P
I/O pin(1)
N
VSS
TTL
Input
Buffer
Q
D
EN
RD PORTB
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.
 2003 Microchip Technology Inc.
Preliminary
DS30487B-page 61
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