PIC16C71T-04/SP 데이터 시트보기 (PDF) - Microchip Technology

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PIC16C71T-04/SP

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C71X

FIGURE 8-22: WAKE-UP FROM SLEEP THROUGH INTERRUPT

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

OSC1

CLKOUT(4)

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

TOST(2)

INT pin

INTF flag

(INTCON<1>)

GIE bit

(INTCON<7>)

Processor in

SLEEP

Interrupt Latency

(Note 2)

INSTRUCTION FLOW

PC

PC

Instruction

fetched

Instruction

executed

Inst(PC) = SLEEP

Inst(PC - 1)

PC+1

Inst(PC + 1)

SLEEP

PC+2

PC+2

Inst(PC + 2)

Inst(PC + 1)

PC + 2

Dummy cycle

0004h

Inst(0004h)

Dummy cycle

0005h

Inst(0005h)

Inst(0004h)

Note 1:

2:

3:

4:

XT, HS or LP oscillator mode assumed.

TOST = 1024TOSC (drawing not to scale) This delay will not be there for RC osc mode.

GIE = '1' assumed. In this case after wake- up, the processor jumps to the interrupt routine. If GIE = '0', execution will continue in-line.

CLKOUT is not available in these osc modes, but shown here for timing reference.

8.9 Program Verification/Code Protection

If the code protection bit(s) have not been pro-

grammed, the on-chip program memory can be read

out for verification purposes.

Note: Microchip does not recommend code pro-

tecting windowed devices.

8.10 ID Locations

Four memory locations (2000h - 2003h) are designated

as ID locations where the user can store checksum or

other code-identification numbers. These locations are

not accessible during normal execution but are read-

able and writable during program/verify. It is recom-

mended that only the 4 least significant bits of the ID

location are used.

8.11 In-Circuit Serial Programming

PIC16CXX microcontrollers can be serially pro-

grammed while in the end application circuit. This is

simply done with two lines for clock and data, and three

other lines for power, ground, and the programming

voltage. This allows customers to manufacture boards

with unprogrammed devices, and then program the

microcontroller just before shipping the product. This

also allows the most recent firmware or a custom firm-

ware to be programmed.

The device is placed into a program/verify mode by

holding the RB6 and RB7 pins low while raising the

MCLR (VPP) pin from VIL to VIHH (see programming

specification). RB6 becomes the programming clock

and RB7 becomes the programming data. Both RB6

and RB7 are Schmitt Trigger inputs in this mode.

After reset, to place the device into programming/verify

mode, the program counter (PC) is at location 00h. A 6-

bit command is then supplied to the device. Depending

on the command, 14-bits of program data are then sup-

plied to or from the device, depending if the command

was a load or a read. For complete details of serial pro-

gramming, please refer to the PIC16C6X/7X Program-

ming Specifications (Literature #DS30228).

FIGURE 8-23: TYPICAL IN-CIRCUIT SERIAL

PROGRAMMING

CONNECTION

External

Connector

Signals

+5V

0V

VPP

CLK

Data I/O

To Normal

Connections

PIC16CXX

VDD

VSS

MCLR/VPP

RB6

RB7

VDD

To Normal

Connections

© 1997 Microchip Technology Inc.

DS30272A-page 67

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