PIC16C62B-20/SS【PDF 84/120 页】IC MCU OTP 2KX14 PWM 28SSOP

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PIC16C62B/72A

DS35008B-page 66

Preliminary

1999 Microchip Technology Inc.

FIGURE 10-10: WAKE-UP FROM SLEEP THROUGH INTERRUPT

10.14

Program Verification/Code Protection

If the code protection bits have not been programmed,

the on-chip program memory can be read out for verifi-

cation purposes.

10.15

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.

For ROM devices, these values are submitted along

with the ROM code.

10.16

In-Circuit Serial Programming

PIC16CXXX 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

more lines for power, ground and the programming volt-

age. This allows customers to manufacture boards with

unprogrammed devices, and then program the micro-

controller just before shipping the product. This also

allows the most recent firmware or a custom firmware

to be programmed.

For complete details of serial programming, please

refer to the In-Circuit Serial Programming (ICSP)

Guide, DS30277.

Q3 Q4

Q1 Q2

Q2 Q3 Q4

Q1 Q2 Q3 Q4

Q2 Q3

Q1 Q2

OSC1

CLKOUT(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 1:

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.

Note:

Microchip does not recommend code pro-

tecting windowed devices.

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