Initialization - Oki PACEMARK 4410 Maintenance Manual

2.1.3

Initialization

This printer is initialized when the power is tumed 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.
40496501TH Rev.1
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
I/F
I/F BUSY OFF
Figure 2.7
Parallel
I/F ACK Send
End
I/F
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