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Can a Microwire type of EEPROM be connected to the 78K0/Kx2?

Latest Updated:11/01/2007

Question:

Can a Microwire type of EEPROM be connected to the 78K0/Kx2?

Answer:

Yes, it can.
When using a Microwire EEPROM, signals are basically handled in synchronization with a serial clock. Data that has been written is captured at the rising edge of the serial clock signal, and read data is output also in synchronization with the rising edge of the serial clock. Transfers are enabled when this phase relationship is aligned. Although the address length varies according to the device, with Microwire the start bit is defined, and when data with any number of zeros added before its start bit, a fixed-length serial interface can be supported.
For example, when the address length is 8 bits, adding the start bit (1 bit) and command bits (2 bits) gives a total of 11 bits, so an 8-bit fixed length can be supported by inserting 5 bits of zeros at the start.
For a read operation, the command bits are "10", so the 8 bits to be transferred would be "00000110".
Suitable Products
RL78 Family
78K0/Kx2
78K0R/Fx
78K0R/Hx
78K0R/Ix
78K0R/Kx
78K0R/Lx