PIC16LC63A-04 Datasheet, PDF (34/184 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16C63A/65B/73B/74B
5.4 PORTD and TRISD Registers
Note:
The PIC16C63A and PIC16C73B do not
provide PORTD. The PORTD and TRISD
registers are not implemented.
PORTD is an 8-bit port with Schmitt Trigger input buff-
ers. Each pin is individually configured as an input or
output.
PORTD can be configured as an 8-bit wide micropro-
cessor port (parallel slave port) by setting control bit
PSPMODE (TRISE<4>). In this mode, the input buffers
are TTL.
FIGURE 5-6:
PORTD BLOCK DIAGRAM
Data
Bus
WR
Port
D
Q
CK
Data Latch
I/O pin⁽¹⁾
WR
TRIS
DQ
CK
TRIS Latch
Schmitt
Trigger
Input
Buffer
RD Port
RD TRIS
Q
D
ENEN
Note 1: I/O pins have protection diodes to VDD and VSS.
TABLE 5-7: PORTD FUNCTIONS
Name
Bit#
Buffer Type
Function
RD0/PSP0
bit0
RD1/PSP1
bit1
RD2/PSP2
bit2
RD3/PSP3
bit3
RD4/PSP4
bit4
RD5/PSP5
bit5
RD6/PSP6
bit6
RD7/PSP7
bit7
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 bit0
Input/output port pin or parallel slave port bit1
Input/output port pin or parallel slave port bit2
Input/output port pin or parallel slave port bit3
Input/output port pin or parallel slave port bit4
Input/output port pin or parallel slave port bit5
Input/output port pin or parallel slave port bit6
Input/output port pin or parallel slave port bit7
Legend: ST = Schmitt Trigger input, TTL = TTL input
Note 1: Input buffers are Schmitt Triggers when in I/O mode and TTL buffer when in Parallel Slave Port mode.
TABLE 5-8: 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.
DS30605C-page 34
 2000 Microchip Technology Inc.