PIC16F87_05 Datasheet, PDF (7/228 Pages) Microchip Technology – 18/20/28-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

1.0 DEVICE OVERVIEW
This document contains device specific information for
the operation of the PIC16F87/88 devices. Additional
information may be found in the “PICmicro^® Mid-Range
MCU Family Reference Manual” (DS33023) which may
be downloaded from the Microchip web site. This
Reference Manual should be considered a comple-
mentary document to this data sheet and is highly
recommended reading for a better understanding of the
device architecture and operation of the peripheral
modules.
The PIC16F87/88 belongs to the Mid-Range family of
the PICmicro^® devices. Block diagrams of the devices
are shown in Figure 1-1 and Figure 1-2. These devices
contain features that are new to the PIC16 product line:
• Low-power modes: RC_RUN allows the core and
peripherals to be clocked from the INTRC, while
SEC_RUN allows the core and peripherals to be
clocked from the low-power Timer1. Refer to
Section 4.7 “Power-Managed Modes” for
further details.
• Internal RC oscillator with eight selectable
frequencies, including 31.25 kHz, 125 kHz,
250 kHz, 500 kHz, 1 MHz, 2 MHz, 4 MHz and
8 MHz. The INTRC can be configured as a
primary or secondary clock source. Refer to
Section 4.5 “Internal Oscillator Block” for
further details.
• The Timer1 module current consumption has
been greatly reduced from 20 µA (previous PIC16
devices) to 1.8 µA typical (32 kHz at 2V), which is
ideal for real-time clock applications. Refer to
Section 7.0 “Timer1 Module” for further details.
• Extended Watchdog Timer (WDT) that can have a
programmable period from 1 ms to 268s. The
WDT has its own 16-bit prescaler. Refer to
Section 15.12 “Watchdog Timer (WDT)” for
further details.
• Two-Speed Start-up: When the oscillator is
configured for LP, XT or HS Oscillator mode, this
feature will clock the device from the INTRC while
the oscillator is warming up. This, in turn, will
enable almost immediate code execution. Refer
to Section 15.12.3 “Two-Speed Clock Start-up
Mode” for further details.
• Fail-Safe Clock Monitor: This feature will allow the
device to continue operation if the primary or
secondary clock source fails by switching over to
the INTRC.
• The A/D module has a new register for PIC16
devices named ANSEL. This register allows
easier configuration of analog or digital I/O pins.
PIC16F87/88
TABLE 1-1: AVAILABLE MEMORY IN
PIC16F87/88 DEVICES
Device
Program
Data
Data
Flash
Memory EEPROM
PIC16F87/88 4K x 14 368 x 8 256 x 8
There are 16 I/O pins that are user configurable on a
pin-to-pin basis. Some pins are multiplexed with other
device functions. These functions include:
• External Interrupt
• Change on PORTB Interrupt
• Timer0 Clock Input
• Low-Power Timer1 Clock/Oscillator
• Capture/Compare/PWM
• 10-bit, 7-channel A/D Converter (PIC16F88 only)
• SPI™/I²C™
• Two Analog Comparators
• AUSART
• MCLR (RA5) can be configured as an input
Table 1-2 details the pinout of the devices with
descriptions and details for each pin.
 2005 Microchip Technology Inc.
DS30487C-page 5