參數(shù)資料
型號： 16F871
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
中文描述： 28/40-Pin 8位CMOS閃存微控制器
文件頁數(shù)： 33/156頁
文件大?。?/td> 2816K
代理商： 16F871
1999 Microchip Technology Inc.
Preliminary
DS30569A-page 33
PIC16F870/871
3.4
PORTD and TRISD Registers
This section is not applicable to the PIC16F870.
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.
FIGURE 3-6:
PORTD BLOCK DIAGRAM (IN
I/O PORT MODE)
TABLE 3-7:
PORTD FUNCTIONS
TABLE 3-8:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTD
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 V
DD
and V
SS
.
Q
D
CK
Q
D
CK
EN
Q
D
EN
Name
Bit#
Buffer Type
Function
RD0/PSP0
bit0
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
RD1/PSP1
bit1
Input/output port pin or parallel slave port bit1
RD2/PSP2
bit2
Input/output port pin or parallel slave port bit2
RD3/PSP3
bit3
Input/output port pin or parallel slave port bit3
RD4/PSP4
bit4
Input/output port pin or parallel slave port bit4
RD5/PSP5
bit5
Input/output port pin or parallel slave port bit5
RD6/PSP6
bit6
Input/output port pin or parallel slave port bit6
RD7/PSP7
bit7
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.
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:
x
= unknown,
u
= unchanged,
-
= unimplemented read as ’0’. Shaded cells are not used by PORTD.
PORTD
TRISD
TRISE
RD7
PORTD Data Direction Register
IBF
OBF
RD6
RD5
RD4
RD3
RD2
RD1
RD0
xxxx xxxx
uuuu uuuu
1111 1111
1111 1111
IBOV
PSPMODE
—
PORTE Data Direction Bits
0000 -111
0000 -111
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