Datasheet

166
8183F–AVR–06/12
ATtiny24A/44A/84A
After data is loaded to the page buffer, program the EEPROM page, see Figure 19-2 on page
165.
19.6 High-voltage Serial Programming
This section describes how to program and verify Flash Program memory, EEPROM Data mem-
ory, Lock bits and Fuse bits in the ATtiny24A/44A/84A.
Figure 19-3. High-voltage Serial Programming
The minimum period for the Serial Clock Input (SCI) during High-voltage Serial Programming is
220 ns.
19.7 High-Voltage Serial Programming Algorithm
To program and verify the ATtiny24A/44A/84A in the High-voltage Serial Programming mode,
the following sequence is recommended (See instruction formats in Table 19-16 on page 170):
Table 19-13. Pin Name Mapping
Signal Name in High-voltage
Serial Programming Mode Pin Name I/O Function
SDI PA6 I Serial Data Input
SII PA5 I Serial Instruction Input
SDO PA4 O Serial Data Output
SCI PB0 I Serial Clock Input (min. 220ns period)
Table 19-14. Pin Values Used to Enter Programming Mode
Pin Symbol Value
PA0 Prog_enable[0] 0
PA1 Prog_enable[1] 0
PA2 Prog_enable[2] 0
VCC
GND
SDO
SII
SDI
(RESET)
+4.5 - 5.5V
PA 6
PA 5
PA 4
PB3
+11.5 - 12.5V
PB0
SCI
PA2:0