PIC16F7X7
FIGURE 5-18:
PORTD BLOCK DIAGRAM
(IN I/O PORT MODE)
5.4
PORTD and TRISD Registers
This section is not applicable to the PIC16F737 or
PIC16F767.
Data Bus
WR Port
D
Q
PORTD is an 8-bit port with Schmitt Trigger input
buffers. Each pin is individually configureable as an
input or output.
I/O pin(1)
CK
Data Latch
PORTD can be configured as an 8-bit wide micro-
processor port (Parallel Slave Port) by setting control
bit, PSPMODE (TRISE<4>). In this mode, the input
buffers are TTL.
D
Q
Schmitt
Trigger
Input
WR TRIS
RD TRIS
CK
TRIS Latch
Buffer
Q
D
EN
EN
RD Port
Note 1: I/O pins have protection diodes to VDD and VSS.
TABLE 5-7:
Name
PORTD FUNCTIONS
Bit#
Buffer Type
Function
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
ST/TTL(1)
Input/output port pin or Parallel Slave Port bit 0.
Input/output port pin or Parallel Slave Port bit 1.
Input/output port pin or Parallel Slave Port bit 2.
Input/output port pin or Parallel Slave Port bit 3.
Input/output port pin or Parallel Slave Port bit 4.
Input/output port pin or Parallel Slave Port bit 5.
Input/output port pin or Parallel Slave Port bit 6.
Input/output port pin or Parallel Slave Port bit 7.
Legend: ST = Schmitt Trigger input, TTL = TTL input
Note 1: Input buffers are Schmitt Triggers when in I/O mode and TTL buffers when in Parallel Slave Port mode.
TABLE 5-8:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
Value on
all other
Resets
Value on:
POR, BOR
Address
Name
Bit 7 Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
08h
PORTD
TRISD
TRISE
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
xxxx xxxx uuuu uuuu
1111 1111 1111 1111
0000 1111 0000 1111
88h
PORTD Data Direction Register
IBF OBF IBOV PSPMODE
(1)
89h
—
PORTE Data Direction bits
Legend:
x= unknown, u= unchanged, — = unimplemented, read as ‘0’. Shaded cells are not used by PORTD.
Note 1: RE3 is an input only. The state of the TRISE3 bit has no effect and will always read ‘1’.
2004 Microchip Technology Inc.
DS30498C-page 67
MICROCHIP [ MICROCHIP ]
