PIC16C74B-20I/L Microchip Technology Inc., PIC16C74B-20I/L Datasheet - Page 34

• Manufacturer Part Number: PIC16C74B-20I/L
• Description: 44 PIN, 7 KB OTP, 192 RAM, 33 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16C74B-20I/L

• A/d Inputs: 8-Channel, 8-Bit
• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 33
• Interface: I2C/SPI/USART
• Memory Type: OTP
• Number Of Bits: 8
• Package Type: 44-pin PLCC
• Programmable Memory: 7K Bytes
• Ram Size: 192 Bytes
• Speed: 4 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2.5-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16C63A/65B/73B/74B
5.4
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.
TABLE 5-7:
TABLE 5-8:
DS30605C-page 34
Name
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
Legend:
Note 1: Input buffers are Schmitt Triggers when in I/O mode and TTL buffer when in Parallel Slave Port mode.
Address
08h
88h
89h
Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PORTD.
Note:
PORTD and TRISD Registers
ST = Schmitt Trigger input, TTL = TTL input
PORTD
TRISD
TRISE
The PIC16C63A and PIC16C73B do not
provide PORTD. The PORTD and TRISD
registers are not implemented.
Name
Bit#
SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
PORTD FUNCTIONS
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
PORTD Data Direction register
Bit 7
RD7
IBF
Bit 6
RD6
OBF
Buffer Type
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
ST/TTL
IBOV
Bit 5
RD5
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
PSPMODE
Bit 4
RD4
Function
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
FIGURE 5-6:
Bit 2
RD2
Note 1: I/O pins have protection diodes to V
WR
TRIS
Data
Bus
WR
Port
RD Port
Bit 1
RD1
Data Latch
TRIS Latch
D
D
CK
CK
RD TRIS
Q
Bit 0
RD0
Q
PORTD BLOCK DIAGRAM
2000 Microchip Technology Inc.
Q
xxxx xxxx
1111 1111
0000 -111
Value on:
POR,
EN
BOR
Schmitt
Trigger
Input
Buffer
EN
D
DD
uuuu uuuu
1111 1111
0000 -111
Value on
I/O pin
RESETS
all other
and V
(1)
SS
.