PIC16C774 Microchip Technology Inc., PIC16C774 Datasheet - Page 34

• Manufacturer Part Number: PIC16C774
• Description: 28/40-pin, 8-bit Cmos Microcontrollers W/ 12-bit A/d
• Manufacturer: Microchip Technology Inc.

TABLE 3-7
TABLE 3-8
PIC16C77X
3.4
This section is applicable to the 40/44-pin devices only.
PORTD is an 8-bit port with Schmitt Trigger input buff-
ers. Each pin is individually configurable 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.
DS30275A-page 34
Name
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
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.
Address Name
08h
88h
89h
Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by PORTD.
PORTD and TRISD Registers
PORTD
TRISD
TRISE
Bit#
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
PORTD FUNCTIONS
SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
PORTD Data Direction Register
Bit 7 Bit 6
RD7
IBF
RD6
OBF IBOV PSPMODE
Buffer Type
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
Bit 5
RD5
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Bit 4
RD4
Advance Information
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
Bit 3
RD3
—
PORTE Data Direction Bits
Bit 2
RD2
FIGURE 3-10: PORTD BLOCK DIAGRAM (IN
Note 1: I/O pins have protection diodes to V
Data
bus
WR
TRIS
WR
PORT
RD PORT
Bit 1
RD1
TRIS Latch
Function
Data Latch
D
D
CK
CK
I/O PORT MODE)
RD TRIS
Bit 0
RD0
Q
Q
1999 Microchip Technology Inc.
xxxx xxxx
1111 1111
0000 -111
Q
Value on:
POR,
BOR
EN
Schmitt
Trigger
input
buffer
EN
D
DD
other resets
Value on all
uuuu uuuu
1111 1111
0000 -111
and V
I/O pin
SS
(1)
.