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Chapter 54 Flash Memory
1.Overview
Chapter 54 Flash Memory
This chapter describes the use of the built-in flash memory.
1. Overview
The MB91F46x devices have built-in Flash memory with a variety of capacities, capable of batch-erasing all
sectors or erasing on the sector level via single +3.0V-5.5V power supply, and writing by the FR-CPU at the
half-word (16-bit) and word (32-bit) level.
2. Features
• Power: Single +3.0-5.5V supply
• Basic specification: Same as MBM29LV400TC (except size and part of sector configuration)
• Faster device operation by enabling commands/data reads at D-word (64-bit) level (not all devices)
• External writers: Interface for Parallel Flash Programmer available.
• Operation modes:
(1) 64-bit CPU mode (not all devices)
CPU reads and executes programs in word (32-bit) length units.
Flash writing is not possible.
Actual Flash Memory access is performed in d-word (64-bit) length units.
(2) 32-bit CPU mode
CPU reads, writes and executes programs in word (32-bit) length units.
Actual Flash Memory access is performed in word (32-bit) length units.
(3) 16-bit CPU mode:
CPU reads and writes in half-word (16-bit) length units.
Program exectuion from the Flash is not possible.
Actual Flash Memory access is performed in word (16-bit) length units.
(4) Flash memory mode (external access to Flash memory enabled)
• Features (Through combination of Flash memory macro and FR-CPU interface circuit):
• Functions as CPU program/data storage memory.
• Enables access to 32-bit bus width.
• Enables read/write/erase by CPU (auto program algorithm
*
).
• Functions equivalent to MBM29LV400TC stand-alone Flash-memory product.
• Enables read/write/erase by parallel Flash programmer (auto program algorithm
*
).
*: Auto program algorithm = Embedded Algorithm TM