PIC16F870T-E/SO Microchip Technology, PIC16F870T-E/SO Datasheet - Page 41

IC MCU CMOS 20MHZ 2K FLSH 28SOIC

PIC16F870T-E/SO

Manufacturer Part Number
PIC16F870T-E/SO
Description
IC MCU CMOS 20MHZ 2K FLSH 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr

Specifications of PIC16F870T-E/SO

Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
3.5KB (2K x 14)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
28-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
4.5
This section is not applicable to the PIC16F870.
PORTE has three pins, RE0/RD/AN5, RE1/WR/AN6
and RE2/CS/AN7, which are individually configurable
as inputs or outputs. These pins have Schmitt Trigger
input buffers.
I/O PORTE becomes control inputs for the micropro-
cessor port when bit PSPMODE (TRISE<4>) is set. In
this mode, the user must make sure that the
TRISE<2:0> bits are set (pins are configured as digital
inputs). Ensure ADCON1 is configured for digital I/O. In
this mode, the input buffers are TTL.
Register 4-1 shows the TRISE register, which also
controls the parallel slave port operation.
PORTE pins are multiplexed with analog inputs. When
selected as an analog input, these pins will read as '0's.
TRISE controls the direction of the RE pins, even when
they are being used as analog inputs. The user must
make sure to keep the pins configured as inputs when
using them as analog inputs.
 2003 Microchip Technology Inc.
Note:
PORTE and TRISE Register
On a Power-on Reset, these pins are
configured as analog inputs.
FIGURE 4-7:
Note 1: I/O pins have protection diodes to V
Data
Bus
WR
TRIS
WR
PORT
RD PORT
TRIS Latch
Data Latch
D
D
PIC16F870/871
CK
CK
RD TRIS
Q
Q
PORTE BLOCK DIAGRAM
(IN I/O PORT MODE)
Q
EN
Schmitt
Trigger
input
buffer
D
DS30569B-page 39
DD
and V
I/O pin
SS
.
(1)

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