MCUs boost functions
22 July 2008
MCUs with on-chip flash, precision clock oscillator with extra I/O pins are certified to automotive standards.
The R8C/Tiny series of 16bit MCUs will be available from Renesas from October. The additions include an 80pin R8C/38E, a 64pin P8C/36E and a 48pin/34E MCU. All 36 new models are claimed to offer enhanced functions and a higher package pin count.
The R8C/Tiny range spans pin packages from 20, 32, 48, 64 and 80, which broadens the choice of MCU for given applications, and able to accommodate specification modifications, according to the company. Functions can be added, or memory increased just by switching to another device in the family.
The MCUs have on-chip flash, a built-in precision clock oscillator and are available as with or without a controller area network interface, with differing amounts of flash ROM and RAM (32kByte/2.5kByte, 48kByte/4kByte and 64kByte/6kByte) with or without on-chip, which has been doubled to 4kByte of data flash2 memory.
The oscillator has the industry’s highest precision ranking at +/- one per cent. It eliminates the need for an external resonator to implement the clock circuit. The integral data flash eliminates the need for external EEPROM for data storage. A background operation function allows the CPU to execute instructions during flash read or write so that programs can be rewritten easily.
Among the new additions is a data transfer controller enables transfer between memory and a register, without CPU intervention to shorten transfer-processing time and to reduce the load on the CPU.
A power-on reset function puts all the circuits in the reset state when the MCU is tuned on. The circuit can be upgraded to accommodate a slower ramp-up of the power supply voltage.
A single-pin debugging interface means that the MCUs can be used with the company’s E8a emulator on chip debugger.
There is a choice of operating temperature ranges, -40°C to 85°C and the extended temperature range, -40°C to 125°C.
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