PIC16LF876A-I Datasheet, PDF (48/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers

PIC16F87XA
4.4 PORTD and TRISD Registers
Note: PORTD and TRISD are not implemented
on the 28-pin devices.
PORTD is an 8-bit port with Schmitt Trigger input
buffers. Each pin is individually configurable as an input
or output.
PORTD can be configured as an 8-bit wide
microprocessor port (Parallel Slave Port) by setting
control bit, PSPMODE (TRISE<4>). In this mode, the
input buffers are TTL.
FIGURE 4-8:
PORTD BLOCK DIAGRAM
(IN I/O PORT MODE)
Data
Bus
WR
Port
Data Latch
D
Q
CK
I/O pin⁽¹⁾
WR
TRIS
TRIS Latch
DQ
CK
RD
TRIS
Schmitt
Trigger
Input
Buffer
RD Port
Q
D
ENEN
Note 1: I/O pins have protection diodes to VDD and VSS.
TABLE 4-7: PORTD FUNCTIONS
Name
Bit#
Buffer Type
Function
RD0/PSP0
bit 0
RD1/PSP1
bit 1
RD2/PSP2
bit2
RD3/PSP3
bit 3
RD4/PSP4
bit 4
RD5/PSP5
bit 5
RD6/PSP6
bit 6
RD7/PSP7
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 4-8: SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
Address Name Bit 7 Bit 6 Bit 5 Bit 4
Bit 3 Bit 2
Bit 1
Bit 0
Value on:
POR, BOR
Value on
all other
Resets
08h
PORTD RD7 RD6 RD5 RD4
RD3 RD2 RD1 RD0 xxxx xxxx uuuu uuuu
88h
TRISD PORTD Data Direction Register
1111 1111 1111 1111
89h
TRISE IBF OBF IBOV PSPMODE — PORTE Data Direction Bits 0000 -111 0000 -111
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by PORTD.
DS39582C-page 48
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