參數(shù)資料
型號: PIC16C662T-20I/L
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 66/136頁
文件大?。?/td> 634K
代理商: PIC16C662T-20I/L
1996 Microchip Technology Inc.
Preliminary
DS30559A-page 35
PIC16C64X & PIC16C66X
5.4
PORTD and TRISD Registers
(PIC16C661 and PIC16C662 only)
PORTD is an 8-bit port with Schmitt Trigger input buff-
ers. Each pin is individually congurable as an input or
output.
PORTD can be congured 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 5-8:
PORTD BLOCK DIAGRAM (IN
I/O PORT MODE)
Data
bus
WR
PORT
WR
TRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
input
buffer
I/O pin(1)
Note 1: I/O pins have protection diodes to VDD and VSS.
Q
D
CK
Q
D
CK
EN
QD
EN
TABLE 5-7:
PORTD FUNCTIONS
TABLE 5-8:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
Name
Bit#
Buffer Type
Function
RD0/PSP0
bit0
ST/TTL(1)
Input/output port pin or parallel slave port bit0
RD1/PSP1
bit1
ST/TTL(1)
Input/output port pin or parallel slave port bit1
RD2/PSP2
bit2
ST/TTL(1)
Input/output port pin or parallel slave port bit2
RD3/PSP3
bit3
ST/TTL(1)
Input/output port pin or parallel slave port bit3
RD4/PSP4
bit4
ST/TTL(1)
Input/output port pin or parallel slave port bit4
RD5/PSP5
bit5
ST/TTL(1)
Input/output port pin or parallel slave port bit5
RD6/PSP6
bit6
ST/TTL(1)
Input/output port pin or parallel slave port bit6
RD7/PSP7
bit7
ST/TTL(1)
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 buffers when in Parallel Slave Port Mode.
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
TRISD7 TRISD6 TRISD5
TRISD4
TRISD3 TRISD2 TRISD1 TRISD0 1111 1111
1111 1111
89h
TRISE
IBF
OBF
IBOV
PSPMODE
TRISE2 TRISE1 TRISE0 0000 -111
0000 -111
Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by PORTD.
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