PIC16F877A-I/P【PDF 67/234 页】IC MCU FLASH 8KX14 EE 40DIP

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2003 Microchip Technology Inc.

DS39582B-page 157

PIC16F87XA

FIGURE 14-12:

WAKE-UP FROM SLEEP THROUGH INTERRUPT

14.15 In-Circuit Debugger

When the DEBUG bit in the configuration word is pro-

grammed to a ‘0’, the in-circuit debugger functionality is

enabled. This function allows simple debugging

functions when used with MPLAB ICD. When the

microcontroller has this feature enabled, some of the

resources are not available for general use. Table 14-8

shows

which

features

are

consumed

the

background debugger.

TABLE 14-8:

DEBUGGER RESOURCES

To use the in-circuit debugger function of the microcon-

troller, the design must implement In-Circuit Serial Pro-

gramming connections to MCLR/VPP, VDD, GND, RB7

and RB6. This will interface to the in-circuit debugger

module available from Microchip or one of the third

party development tool companies.

14.16 Program Verification/Code

Protection

the

code

protection

bit(s)

have

not

been

programmed, the on-chip program memory can be

read out for verification purposes.

14.17 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

readable and writable during program/verify. It is

recommended that only the 4 Least Significant bits of

the ID location are used.

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

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

OSC1

CLKO(4)

INT pin

INTF Flag

(INTCON<1>)

GIE bit

(INTCON<7>)

INSTRUCTION FLOW

Instruction

Fetched

Instruction

Executed

PC+1

PC+2

Inst(PC) = Sleep

Inst(PC - 1)

Inst(PC + 1)

Sleep

Processor in

Sleep

Interrupt Latency(2)

Inst(PC + 2)

Inst(PC + 1)

Inst(0004h)

Inst(0005h)

Inst(0004h)

Dummy cycle

PC + 2

0004h

0005h

Dummy cycle

TOST(2)

PC+2

Note 1: XT, HS or LP Oscillator mode assumed.

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

3: GIE = 1 assumed. In this case, after wake- up, the processor jumps to the interrupt routine.

If GIE = 0, execution will continue in-line.

4: CLKO is not available in these oscillator modes but shown here for timing reference.

I/O pins

RB6, RB7

Stack

1 level

Program Memory

Address 0000h must be NOP

Last 100h words

Data Memory

0x070 (0x0F0, 0x170, 0x1F0)

0x1EB-0x1EF

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