RX21A中文資料瑞薩數(shù)據(jù)手冊(cè)PDF規(guī)格書

■ 32-bit RX CPU core

? Max. operating frequency: 50 MHz

Capable of 78 DMIPS in operation at 50 MHz

? Accumulator handles 64-bit results (for a single

instruction) from 32- × 32-bit operations

? Multiplication and division unit handles 32- × 32-bit

operations (multiplication instructions take one CPU

clock cycle)

? Fast interrupt

? CISC Harvard architecture with 5-stage pipeline

? Variable-length instructions, ultra-compact code

? Memory protection unit

? On-chip debugging circuit

■ Low power design and architecture

? Operation from a single 1.8-V to 3.6-V supply

(2.7 V to 3.6 V for the ΔΣ A/D converter operating

voltage)

? Deep software standby mode with RTC remaining usable

? Four low power modes

■ 24-bit ΔΣ A/D Converter

? SNDR = 85dB

? Seven ΔΣ converter units available. Seven channels can

be operated simultaneously or independently.

? Up to x 64 PGA gain for differential input

■ On-chip flash memory for code, no wait states

? 50-MHz operation, 20-ns read cycle

? No wait states for reading at full CPU speed

? 256-K to 512-Kbyte capacities

? User code programmable via the SCI

? Programmable at 1.8 V

? For instructions and operands

■ On-chip data flash memory

? 8 Kbytes

(Number of times of reprogramming: 100,000)

? Erasing and programming impose no load on the CPU.

■ On-chip SRAM, no wait states

? 32-K to 64-Kbyte size capacities

■ DMA

? DMAC: Incorporates four channels

? DTC: Four transfer modes

■ Reset and supply management

? Nine types of reset, including the power-on reset (POR)

? Low voltage detection (LVD) with voltage settings

■ Clock functions

? Frequency of external clock: Up to 20 MHz

? Frequency of the oscillator for sub-clock generation:

32.768 kHz

? PLL circuit input: 4 MHz to 12.5 MHz

? On-chip low- and high-speed oscillators, dedicated onchip

low-speed oscillator for the IWDT

? Generation of a dedicated 32.768-kHz clock for the RTC

? Clock frequency accuracy measurement circuit (CAC)

■ Real-time clock

? Adjustment functions (30 seconds, leap year, and error)

? Year and month display or 32-bit second display (binary

counter) is selectable

? Time capture on event-signal input through external pins

? RTC capable of initiating return from deep software

standby mode