PIC14000 datasheet(89/153 Pages) MICROCHIP

89 / 153 page

Preliminary

DS40122B-page 89

PIC14000

FIGURE 10-13: WAKE-UP FROM SLEEP AND HIBERNATE THROUGH INTERRUPT

Note

HS oscillator mode assumed.

TOST = 1024 TOSC (drawing not to scale). This delay will be 8 TOSC for IN osc mode.

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

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

Refer to Section 10.8 for sources.

Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

OSC1

CLKOUT(4)

INTERRUPT

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)

Flag (5)

10.9

Code Protection

The code in the program memory can be protected by

programming the code protect bits. When code

protected, the contents of the program memory cannot

be read out. In code-protected mode, the conﬁguration

word (2007h) will not be scrambled, allowing reading of

all conﬁguration bits.

10.10

In-Circuit Serial Programming

PIC14000 can be serially programmed 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 allows the most recent ﬁrmware or a

custom ﬁrmware to be programmed.

The device is placed into a program/verify mode by

holding the RC6/SCL and RC7/SDA pins low while

raising the MCLR (VPP) pin from VIL to VIH. RC6 then

becomes the programming clock and RC7 becomes

the programmed data. Both RC6 and RC7 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 supplied to or from the device. For complete

details about serial programming, please refer to the

PIC16C6X/7X Programming Speciﬁcations (Literature

#DS30228).

A typical in-system serial programming connection is

shown in Figure 10-14.

FIGURE 10-14: TYPICAL IN-SYSTEM SERIAL

PROGRAMMING

CONNECTION

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC14000

VDD

VSS

MCLR/VPP

RC6

RC7

+5V

Vpp

CLK

Data I/O

VDD

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