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