Product category:
Microprocessors, Microcontrollers and DSPs
News Release from: Hitachi Europe | Subject: H8S/2674R
Edited by the Electronicstalk Editorial
Team on 29 April 2002
MCU supports direct SDRAM connection
The high-performance H8S/2674R microcontroller is a ROM-less addition to the Hitachi H8S/267x series, and offers over 16MIPS Dhrystone when executing from on-chip memory.
The high-performance H8S/2674R microcontroller is a ROM-less addition to the Hitachi H8S/267x series, and offers over 16MIPS Dhrystone when executing from on-chip memory The H8S/2674R is the first 16bit microcontroller on the market to offer direct connection to SDRAM
This article was originally published on Electronicstalk on 16 Feb 2001 at 8.00am (UK)
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The H8S/2674R itself is a low cost ROM-less device and allows easy connection of megabytes of cheap external Flash and SDRAM.
The result is a system that costs little, but offers high-end 16bit performance plus vast amounts of memory".
The H8S/2674R features a general purpose, register architecture H8S CPU, with eight 32bit wide registers, instruction prefetch and a 16Mbyte linear address range.
It also has a hardware multiply-accumulate unit (MAC), which accelerates DSP-type algorithms by a factor of between two and three, when compared with H8S derivatives without MAC.
Using MAC, a 16 x 16bit multiply can be executed in 90ns at 33MHz.
The device's comprehensive peripheral set includes direct memory access (DMA), data transfer controller (DTC, a versatile pseudo DMA), a highly sophisticated six channel 16bit timer unit (TPU) with up to 16 input capture and output compare, 16 channel real time outputs (PPG) and three channel SCIs.
Also included on the device are a 12-channel 10bit ADC, a four channel 8bit DAC and up to 71 I/O lines, some of which feature programmable pull-up and open drain, as well as Schmitt trigger and interrupt capability.
All SCIs provide for asynchronous, synchronous, multiprocessor and a subset of ISO7816-3 communication.
One SCI also has an IrDA mode.
Clock generation is via a PLL circuit to minimise the power consumption and to ease radiation problems.
The device also has several low power features including clock gearing and standby modes.
Unused peripherals and the CPU can be shut down under software control.
The H8S/2674R is supported by Hitachi's E6000 emulator and by Lauterbach's Trace32-FIRE (under development).
It is available immediately in a 1.7mm thick 144-pin quad flat package (QFP), under the part name HD6412674RVFQ33.
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