PIC18F2220 MICROCHIP [Microchip Technology], PIC18F2220 Datasheet - Page 111

• Manufacturer Part Number: PIC18F2220
• Description: 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

10.4
PORTD is an 8-bit wide, bidirectional port. The corre-
sponding data direction register is TRISD. Setting a
TRISD bit (= 1) will make the corresponding PORTD
pin an input (i.e., put the corresponding output driver in
a High-Impedance mode). Clearing a TRISD bit (= 0)
will make the corresponding PORTD pin an output (i.e.,
put the contents of the output latch on the selected pin).
The Data Latch register (LATD) is also memory mapped.
Read-modify-write operations on the LATD register read
and write the latched output value for PORTD.
All pins on PORTD are implemented with Schmitt Trig-
ger input buffers. Each pin is individually configurable
as an input or output.
Three of the PORTD pins are multiplexed with outputs
P1B, P1C and P1D of the Enhanced CCP module. The
operation of these additional PWM output pins is
covered in greater detail in Section 16.0 “Enhanced
Capture/Compare/PWM (ECCP) Module”.
FIGURE 10-11:
 2003 Microchip Technology Inc.
Note:
Note:
PORTD, TRISD and LATD
Registers
PORTD is only available on PIC18F4X20
devices.
On a Power-on Reset, these pins are
configured as digital inputs.
PORTD/CCP1 Select
CCP Data Out
PSPMODE
RD LATD
Data Bus
WR LATD
or PORTD
RD PORTD
RD TRISD
WR TRISD
PSP Read
PSP Write
Note 1:
BLOCK DIAGRAM OF RD7:RD5 PINS
I/O pins have diode protection to V
TRIS Latch
Data Latch
D
D
CK
CK
Q
Q
Q
Q
PIC18F2220/2320/4220/4320
0
1
DD
and V
0
1
Q
SS
.
EN
PORTD can also be configured as an 8-bit wide micro-
processor port (Parallel Slave Port) by setting control
bit, PSPMODE (TRISE<4>). In this mode, the input
buffers are TTL. See Section 10.6 “Parallel Slave
Port” for additional information on the Parallel Slave
Port (PSP).
EXAMPLE 10-4:
EN
CLRF
CLRF
MOVLW
MOVWF
1
0
D
Note:
PORTD
LATD
0xCF
TRISD
1
0
When the enhanced PWM mode is used
with either dual or quad outputs, the PSP
functions of PORTD are automatically
disabled.
TTL Buffer
; Initialize PORTD by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Value used to
; initialize data
; direction
: Set RD<3:0> as inputs
; RD<5:4> as outputs
; RD<7:6> as inputs
V
N
V
Schmitt Trigger
Input Buffer
P
INITIALIZING PORTD
DD
SS
DS39599C-page 109
I/O pin
(1)