GENERAL

The µPD784938 Subseries consists of 78K/IV Series products that combine a 78K/IV Series CPU core enabling mounting large-capacity memory and a IEBusTM (Inter Equipment BusTM) controller. The 78K/IV Series consists of 16-bit single-chip microcontrollers, and comes with a high-performance CPU that has various functions including a function to access 1-Mbyte memory spaces.

Features

• 78K/IV Series

• High-speed instruction execution

• Minimum instruction execution time: 320 ns (@ 6.29-MHz operation)

160 ns (@ 12.58-MHz operation)

• Instruction set suitable for control applications

• Data memory expansion function (1-Mbyte memory space: 2 bank specification pointers)

• Interrupt controller (4-level priority system)

• Vectored interrupt service/macro service/context switching

• Standby functions: HALT/STOP/IDLE modes

• Internal memory: • ROM

Mask ROM: 256 Kbytes (µPD784938)

192 Kbytes (µPD784937)

128 Kbytes (µPD784936)

96 Kbytes (µPD784935)

Flash memory: 256 Kbytes (µPD78F4938)

• RAM: 10,240 bytes (µPD784938, 78F4938)

8,192 bytes (µPD784937)

6,656 bytes (µPD784936)

5,120 bytes (µPD784935)

• I/O pins: 80

• Software programmable pull-up: 70 inputs

• Direct LED drive capability: 24 outputs

• Direct transistor drive capability: 8 outputs

• N-ch open-drain: 4 outputs

• Serial interface

• UART/IOE (3-wire serial I/O): 2 channels (with on-chip baud rate generator)

• CSI (3-wire serial I/O): 2 channels

• Real-time output ports (combination with timer/counter allows independent control of 2-system stepping motors)

• A/D converter (8-bit resolution × 8 channels)

• PWM outputs (12-bit resolution × 2 channels)

• On-chip simple model with IEBus controller

• Watch timer (operation with main clock possible in the IDLE mode)

• Power-saving regulator

• High-performance timer/counter

• Timer/event counter (16 bits) × 3 units

• Timer (16 bits) × 1 unit

• Watchdog timer: 1 channel

• Clock output function: fCLK, fCLK/2, fCLK/4, fCLK/8, fCLK/16 can be selected

• On-chip ROM correction function