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The INIT register is a special-purpose 8-bit register which may be used during initialization to change the default locations of RAM and control registers within the MCU memory map. It may be written to only once within the initial 64 E clock cycles after a reset and thereafter becomes a read-only register. $103D RESET 7 RAM3 0 6 RAM2 0 5 RAM1 0 4 RAM0 0 3 REG3 0 2 REG2 0 1 REG1 0 0 REG0 1 INIT The default starting address for internal RAM is $0000 and the default starting address for the 64 control registers is $1000 (the INIT register is set to $01 at reset).
For example, programming $50 to a location which was already $55 would change the location to $50. Programming and erasure of the EEPROM relies on an internal high-voltage charge pump. At E clock frequencies below 2 MHz the efficiency of this charge pump decreases which increases the time required to program or erase a location. The recommended program and erase time is 10 milliseconds when the E clock is 2 MHz and should be increased to as much as 20 milliseconds when E is between 1 MHz and 2 MHz.
These registers can be relocated on 4K boundaries within the memory space, using the INIT register. Refer to Table 3-1 for a complete list of the registers. The registers and control bits are explained throughout this document. The INIT register is a special-purpose 8-bit register which may be used during initialization to change the default locations of RAM and control registers within the MCU memory map. It may be written to only once within the initial 64 E clock cycles after a reset and thereafter becomes a read-only register.