R80515

8-bit Microcontroller

Megafunction

General Description

The R80515 is a fast, single-chip, 8-bit microcontroller that executes all ASM51 instructions. It has the same

instruction set as the 80C31, but executes operations an average of 8 times faster.

The R80515 provides software and hardware interrupts, extra timer features, power management, and Infinion

peripherals support. On-chip debugging is an option.

The microcode-free, strictly synchronous design was developed for reuse in ASICs and FPGAs.

Features

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Single clock per machine cycle

Reduced instruction cycle time up to 12 times

8-bit Control Unit

8-bit Arithmetic-Logic Unit

Multiplication/Division Unit

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16 x 16-bit multiplication and division; 32 / 16-bit division

Four 8-bit Input/Output ports

Alternate port functions such as external interrupts & serial interface are separated, providing extra port

pins when compared with the standard 8051

Three 16-bit Timer/Counters

Compare/Capture Unit

Two Serial Peripheral Interfaces in full duplex mode

Four priority/thirteen sources Interrupt Controller

15-bit Programmable Watchdog Timer

Internal Data Memory interface can address up to 256 bytes of Read/Write Data Memory Space

External Memory interface

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Can address up to 64 K bytes of External Program Memory Space

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Can address up to 64K bytes of External Data Memory Space

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De-multiplexed address/data bus to allow easy connection to memories

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Variable length MOVX to access fast/slow RAM or peripherals

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Variable length code fetch and MOVC to access fast/slow program memory

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Dual data pointer for fast data block transfers

Special Function Registers interface: serves up to 74 external registers

Power Management Unit

Optional JTAG debugging

CAST, Inc.

March 2004

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