PIC16F818-ESLASHML datasheet(102/176 Pages) MICROCHIP

102 / 176 page

PIC16F818/819

DS39598E-page 100

 2004 Microchip Technology Inc.

FIGURE 12-9:

WAKE-UP FROM SLEEP THROUGH INTERRUPT

12.14 In-Circuit Debugger

When the DEBUG bit in the Configuration Word is

programmed to a ‘0’, the In-Circuit Debugger function-

ality 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 12-6

shows which features are consumed by the background

debugger.

TABLE 12-6:

DEBUGGER RESOURCES

To use the In-Circuit Debugger function of the micro-

controller, the design must implement In-Circuit Serial

Programming 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.

12.15 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.

12.16 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 four 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

(Note 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

XT, HS or LP Oscillator mode assumed.

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

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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