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BJC-6000
Buffer controller
Writes the received data into the DRAM's receive buffer automatically, controls the
remaining receive buffer capacity, reads the print buffer automatically, and clears
the data that has been read. The print buffer manages two separate areas for the 2
heads.
DRAM controller
Performs control of the 16Mbit-DRAM's 16-bit data bus and 10-bit address bus,
READ/WRITE control, RAS/CAS control, and REFRESH control, using the bus
dedicated to DRAM which is separate from the MPU bus inside the printer
controller.
Stepping motor controller
Transfers to the driver IC the steady current drive waveforms needed to drive
motors. As the motor is sinuously driven, the data to be transferred to the IC is
16-bit/step drive waveform serial data that consists of motor drive current, motor
torque setting, phase information, etc.
Interrupt controller
The printer controller has 4 interrupt pins on it. The interrupt controller generates
parallel I/F, motor drive, and head drive interrupt requests to MPU(IC201). Also, it
accepts an interrupt signal from the reset IC.
I/O port
Sends indicator lighting and the power supply voltage output control signals as
output signals, receives sensor signals from the home position sensor, pump
sensor, and paper end sensor as input signals, controls the EEPROM data I/O,
and sends the motor driver reset signal as output.
b) MPU (IC201)
Incorporates a 32-bit CPU, 6Kbit work RAM, 21-bit address bus port, 16-bit data
bus port, interrupt controller, A/D converter, and I/O port. The MPU selects the
control ROM, printer controller, or DRAM according to the chip select signal.
Built-in CPU
32-bit CPU operates in sync with the 20MHz external clock input.
Address bus/Data bus
The 21-bit address bus and 16-bit data bus operate in sync with the 20MHz
external clock input.
Interrupt controller
Allows the MPU to receive the power on/off interrupt signal, as well as interrupt
signals from the printer controller.
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Part 4: Technical Reference
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