Configuration Section

ATtiny4/5/9/10 have one configuration byte, which resides in the configuration section.

Table 1. Configuration bytes
Configuration word address Configuration word data
High byte Low byte
0x00 Reserved Configuration Byte 0
0x01 ... 0x07 Reserved Reserved

The next table briefly describes the functionality of all configuration bits and how they are mapped into the configuration byte.

Table 2. Configuration Byte 0
Bit   Description Default Value
7:3 Reserved 1 (unprogrammed)
2 CKOUT System Clock Output 1 (unprogrammed)
1 WDTON Watchdog Timer always on 1 (unprogrammed)
0 RSTDISBL External Reset disable 1 (unprogrammed)

Configuration bits are not affected by a chip erase but they can be cleared using the configuration section erase command (see Erasing the Configuration Section in this chapter). Note that configuration bits are locked if Non- Volatile Lock Bit 1 (NVLB1) is programmed.