20
2.1.3 Initialization
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 RESET-N signal is first output from the reset circuit to reset the MPU
and LSIs. When resetting ends, the program starts and the LSIs are reset by NHDC LSI via
LRESET-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.
Figure 2.7
End
I/F BUSY OFF
Serial
I/F
I/F ACK Send
Parallel
I/F
LF Motor Phase
Initialization
Carriage Homing
RAM Clear
LSI Initial Setting
and I/F Busy ON
External RAM
CHECK
LSI RESET
ROM CHECK
Internal RAM
CHECK
MPU
Initial Setting
MPU RESET
Start
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