16F87 datasheet(7/228 Pages) MICROCHIP

7 / 228 page

 2005 Microchip Technology Inc.

DS30487C-page 5

PIC16F87/88

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.

TABLE 1-1:

AVAILABLE MEMORY IN

PIC16F87/88 DEVICES

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.

Device

Program

Flash

Data

Memory

Data

EEPROM

PIC16F87/88

4K x 14

368 x 8

256 x 8

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