PIC16F72-I/ML【PDF 12/136 页】IC PIC MCU FLASH 2KX14 28-QFN

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109

2535J–AVR–08/10

ATtiny13

The minimum period for the Serial Clock Input (SCI) during High-voltage Serial Programming is

220 ns.

17.7.1

High-Voltage Serial Programming Algorithm

To program and verify the ATtiny13 in the High-voltage Serial Programming mode, the following

sequence is recommended (See instruction formats in Table 17-13 on page 110):

The following algorithm puts the device in High-voltage Serial Programming mode:

1. Set Prog_enable pins listed in Table 17-11 to “000”, RESET pin to “0” and Vcc to 0V.

2. Apply 4.5 - 5.5V between VCC and GND. Ensure that Vcc reaches at least 1.8V within

the next 20s.

3. Wait 20 - 60s, and apply 11.5 - 12.5V to RESET.

4. Keep the Prog_enable pins unchanged for at least 10s after the High-voltage has

been applied to ensure the Prog_enable Signature has been latched.

5. Release the Prog_enable[2] pin to avoid drive contention on the Prog_enable[2]/SDO

pin.

6. Wait at least 300s before giving any serial instructions on SDI/SII.

7. Exit Programming mode by power the device down or by bringing RESET pin to 0V.

If the rise time of the Vcc is unable to fulfill the requirements listed above, the following alterna-

tive algorithm can be used.

1. Set Prog_enable pins listed in Table 17-11 to “000”, RESET pin to “0” and Vcc to 0V.

2. Apply 4.5 - 5.5V between VCC and GND.

3. Monitor Vcc, and as soon as Vcc reaches 0.9 - 1.1V, apply 11.5 - 12.5V to RESET.

4. Keep the Prog_enable pins unchanged for at least 10s after theHigh-voltage has been

applied to ensure the Prog_enable Signature has been latched.

5. Release the Prog_enable[2] pin to avoid drive contention on the Prog_enable[2]/SDO

pin.

Table 17-10. Pin Name Mapping

Signal Name in High-voltage

Serial Programming Mode

Pin Name

I/O

Function

SDI

PB0

Serial Data Input

SII

PB1

Serial Instruction Input

SDO

PB2

Serial Data Output

SCI

PB3

Serial Clock Input (min. 220ns period)

Table 17-11. Pin Values Used to Enter Programming Mode

Pin

Symbol

Value

SDI

Prog_enable[0]

SII

Prog_enable[1]

SDO

Prog_enable[2]

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