The printer control unit consists of a printer controller ASIC (IC1:Hurricane), printer controller CPU bus connection ASIC(With control PWB), and analog

ASIC(IC3: Thunderbolt) with a built-in motor driver and head voltage generating circuit.

1) Hurricane(IC1): (RH-IX2314XHZZ)

This is ASIC where CPU(ARM7) of 32-bit RISC works as its core and peripheral features are integrated. It is also equipped with the firmware ROM,

buffer ROM, and IEEE1284 parallel port interface. Data communication with the main controller is performed via Alcore ASIC. Data from Alcore ASIC is

transferred to the controller in the compatible mode or ECP mode of IEEE1284, and the controller sends the status of the printer in the nibble mode. The

operating frequency is 24 MHz.

2) Thunderbolt(IC3): pin-44 PLCC(VHIPC901054-1)

Motor drivers of the FD and CR motors, and head voltage(11.82V) generating regulator of the printer carriage are integrated into this analog ASIC.

Each motor control register is set by the one-way synchronous serial transfer via the printer controller, Hurricane.

PCLK

PDAT

PD65944

PLAT

MAIN CLOCK

PD(8:1)

HURRICANE

CONTROL