PIC10F220 datasheet(39/86 Pages) MICROCHIP

39 / 86 page

DS41270E-page 41

PIC10F220/222

8.9.2

WAKE-UP FROM SLEEP

The device can wake-up from Sleep through one of the

following events:

An external Reset input on GP3/MCLR/VPP pin,

when configured as MCLR.

A Watchdog Timer Time-out Reset (if WDT was

enabled).

A change on input pin GP0, GP1 or GP3 when

wake-up on change is enabled.

These events cause a device Reset. The TO, PD

GPWUF bits can be used to determine the cause of a

device Reset. The TO bit is cleared if a WDT time-out

occurred (and caused wake-up). The PD bit, which is

set on power-up, is cleared when SLEEP is invoked.

The GPWUF bit indicates a change in state while in

Sleep at pins GP0, GP1 or GP3 (since the last file or bit

operation on GP port).

8.10

Program Verification/Code

Protection

If the Code Protection bit has not been programmed,

the on-chip program memory can be read out for

verification purposes.

The first 64 locations and the last location (Reset

Vector) can be read, regardless of the code protection

bit setting.

8.11

ID Locations

Four memory locations 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.

Use only the lower 4 bits of the ID locations and always

program the upper 8 bits as ‘1’s.

8.12

In-Circuit Serial Programming™

The PIC10F220/222 microcontrollers 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

also allows the most recent firmware, or a custom

firmware, to be programmed.

The devices are placed into a Program/Verify mode by

holding the GP1 and GP0 pins low while raising the

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

specification). GP1 becomes the programming clock

and GP0 becomes the programming data. Both GP1

and GP0 are Schmitt Trigger inputs in this mode.

After Reset, a 6-bit command is then supplied to the

device. Depending on the command, 16 bits of program

data are then supplied to or from the device, depending

if the command was a Load or a Read. For complete

details of serial programming, please refer to the

PIC10F220/222 Programming Specifications.

A typical In-Circuit Serial Programming connection is

shown in Figure 8-10.

FIGURE 8-10:

TYPICAL IN-CIRCUIT

SERIAL

PROGRAMMING™

CONNECTION

Caution: Right before entering Sleep, read the

input pins. When in Sleep, wake up

occurs when the values at the pins

change from the state they were in at the

last reading. If a wake-up on change

occurs and the pins are not read before

re-entering Sleep, a wake-up will occur

immediately even if no pins change

while in Sleep mode.

Note:

The WDT is cleared when the device

wakes from Sleep, regardless of the wake-

up source.

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC10F22X

VDD

VSS

MCLR/VPP

GP1

GP0

+5V

VPP

CLK

Data I/O

VDD

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