Oki 3321, 3320 specifications MPU Reset, Check, LSI Reset, Busy OFF

2.1.3Initialization

This printer is initialized when the power is turned on or when the I-PRIME-N signal is input from the host side via the parallel interface.

For the initialize operation, the RST-N signal is first output from the reset circuit to reset the MPUs and LSIs. When resetting ends, the program starts and the LSIs are reset by MPU via LSIRST-N. Reset operation by I-PRIME starts program to initialize, but does not reset the MPU.

The program here sets the mode of the LSI including the MPU, checks the memories (ROMs and RAMs), then carries out carriage homing, and determines the LF motor phase.

Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F: BUSY-N signal off) and lights the SELECT lamp to inform the ready state for receiving to the host side and ends the initialize operation.

		Start
		MPU	RESET
		MPU
		Initial Setting
		Internal RAM
		CHECK
		ROM CHECK
		LSI RESET
		External RAM
		CHECK
	LSI Initial Setting
	and I/F Busy ON
		RAM Clear
	Carriage Homing
		LF Motor Phase
		Initialization
Serial					Parallel
I/F					I/F
I/F BUSY OFF				I/F ACK	Send

End

2 – 7