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EM78M611E
Universal Serial Bus Series Microcontroller
Product Specification (V1.11) 04.20.2007
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(This specification is subject to change without further notice)
ERC (AD MSB Data Register) Default Value: (0B_0000_0000)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
2 bits AD MSB Digital Data.
ERD (AD Control Register) Default Value: (0B_0000_0000)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 - ADPS1
ADPS0
ERD [0 1]: The clock source of AD converting time.
00: 256kHz
01: 128kHz
10: 64kHz
11: 32kHz
8.12 EEPROM
Four bytes of EEPROM are located in the R2C~R2F of Bank 3. The stored data of
EEPROM are not erased when the power is off and can be read and re-written by
firmware. In some special case of application, for example, cordless keyboard
controller, it can store important data, such as the cordless keyboard’s device identical
number.
A control register, ERA controls the EEPROM, that is, to read, write, or to erase the
data from EEPROM. Writing a command into this register will execute an action to the
EEPROM. The command value is defined in the following tale. Note that there is an
execution time laps for each command. Before writing the next command into the
control register, allow enough time for the EEPROM to finish the previous command.
Command Value Action Execution Time
0B_0000_0000 Read 1 ms
0B_0000_0001 Write 9 ms
0B_0000_0010 Erase 128 ms
0B_0000_0011 Disable N.A.