PIC18F8520-I/PT Microchip Technology Inc., PIC18F8520-I/PT Datasheet - Page 116
PIC18F8520-I/PT
Manufacturer Part Number
PIC18F8520-I/PT
Description
80 PIN, 32 KB FLASH, 2048 RAM, 68 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F8520-IPT.pdf
(380 pages)
Specifications of PIC18F8520-I/PT
A/d Inputs
16-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
1024 Bytes
Input Output
68
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
80-pin TQFP
Programmable Memory
32K Bytes
Ram Size
2K Bytes
Speed
40 MHz
Timers
2-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
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PIC18F6520/8520/6620/8620/6720/8720
10.5
PORTE is an 8-bit wide, bidirectional port. The corre-
sponding data direction register is TRISE. Setting a
TRISE bit (= 1) will make the corresponding PORTE
pin an input (i.e., put the corresponding output driver in
a high-impedance mode). Clearing a TRISE bit (= 0)
will make the corresponding PORTE pin an output (i.e.,
put the contents of the output latch on the selected pin).
Read-modify-write operations on the LATE register,
read and write the latched output value for PORTE.
PORTE is an 8-bit port with Schmitt Trigger input buff-
ers. Each pin is individually configurable as an input or
output. PORTE is multiplexed with the CCP module
(Table 10-9).
On PIC18F8X20 devices, PORTE is also multiplexed
with the system bus as the external memory interface;
the I/O bus is available only when the system bus is
disabled, by setting the EBDIS bit in the MEMCON
register (MEMCON<7>). If the device is configured in
Microprocessor or Extended Microcontroller mode,
then the PORTE<7:0> becomes the high byte of the
address/data bus for the external program memory
interface. In Microcontroller mode, the PORTE<2:0>
pins become the control inputs for the Parallel Slave
Port when bit PSPMODE (PSPCON<4>) is set. (Refer
to Section 4.1.1 “PIC18F8X20 Program Memory
Modes” for more information on program memory
modes.)
DS39609B-page 114
PORTE, TRISE and LATE
Registers
When the Parallel Slave Port is active, three PORTE
pins (RE0/RD/AD8, RE1/WR/AD9 and RE2/CS/AD10)
function as its control inputs. This automatically occurs
when the PSPMODE bit (PSPCON<4>) is set. Users
must also make certain that bits TRISE<2:0> are set to
configure the pins as digital inputs and the ADCON1
register is configured for digital I/O. The PORTE PSP
control functions are summarized in Table 10-9.
Pin RE7 can be configured as the alternate peripheral
pin for CCP module 2 when the device is operating in
Microcontroller mode. This is done by clearing the
configuration bit, CCP2MX, in configuration register,
CONFIG3H (CONFIG3H<0>).
EXAMPLE 10-5:
CLRF
CLRF
MOVLW
MOVWF
Note:
PORTE
LATE
0x03
TRISE
For PIC18F8X20 (80-pin) devices operat-
ing in Extended Microcontroller mode,
PORTE defaults to the system bus on
Power-on Reset.
; Initialize PORTE by
; clearing output
; data latches
; Alternate method
; to clear output
; data latches
; Value used to
; initialize data
; direction
; Set RE1:RE0 as inputs
; RE7:RE2 as outputs
INITIALIZING PORTE
2004 Microchip Technology Inc.
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