PIC16CR7X Datasheet, PDF (38/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS ROM Microcontrollers

PIC16CR7X
4.4 PORTD and TRISD Registers
This section is not applicable to the PIC16CR73 or
PIC16CR76.
PORTD is an 8-bit port with Schmitt Trigger input buff-
ers. Each pin is individually configureable as an input or
output.
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.
FIGURE 4-6:
PORTD BLOCK DIAGRAM
(IN I/O PORT MODE)
Data Bus
WR Port
WR TRIS
D
Q
CK
Data Latch
DQ
CK
TRIS Latch
I/O pin⁽¹⁾
Schmitt
Trigger
Input
Buffer
RD TRIS
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
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 0
RD1/PSP1
bit 1
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 1
RD2/PSP2
bit 2
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 2
RD3/PSP3
bit 3
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 3
RD4/PSP4
bit 4
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 4
RD5/PSP5
bit 5
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 5
RD6/PSP6
bit 6
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit 6
RD7/PSP7
bit 7
ST/TTL⁽¹⁾
Input/output port pin or parallel slave port bit
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
88h
89h
Legend:
PORTD RD7 RD6 RD5
RD4
RD3 RD2
RD1
RD0 xxxx xxxx
TRISD PORTD Data Direction Register
1111 1111
TRISE
IBF OBF IBOV PSPMODE — PORTE Data Direction bits
0000 -111
x = unknown, u = unchanged, – = unimplemented read as ‘0’. Shaded cells are not used by PORTD.
uuuu uuuu
1111 1111
0000 -111
DS21993C-page 36
© 2007 Microchip Technology Inc.