Datasheet

171
7701F–AVR–10/12
Atmel ATtiny24/44/84 [Preliminary]
21.7 High-voltage Serial Programming
This section describes how to program and verify Flash Program memory, EEPROM Data
memory, Lock bits and Fuse bits in the Atmel
®
ATtiny24/44/84.
Figure 21-3. High-voltage Serial Programming
The minimum period for the Serial Clock Input (SCI) during High-voltage Serial Programming
is 220ns.
Table 21-12. 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 21-13. 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)
+1.8 - 5.5V
PA6
PA5
PA4
PB3
+11.5 - 12.5V
PB0
SCI