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參數(shù)資料
| 型號： | USING |
| 英文描述： | Using the Expanded Memory Mode with the M16C/62 |
| 中文描述： | 使用帶有擴展內(nèi)存雙隨機PWM模式 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 831K |
| 代理商： | USING |
M16C/62
A
PPLICATION
N
OTE
Using the Expanded Memory Mode with the M16C/62
1. Abstract
The following article introduces and shows an example of how to access external memory using the
expanded memory mode of the M16C/62 series of microcontrollers.
2. Introduction
The Mitsubishi M16C/62 series of microcontrollers is a 16-bit family of MCUs, based on Mitsubishi’s
popular M16C CPU core. These parts provide high memory efficiency, power-saving ability, low noise
emission, and improved noise immunity. The M16C/62 part series can be used in many applications such
as office equipment, PC peripherals, portable devices, automotive, cameras, audio, and so on.
This application note shows how to configure and use the expanded memory mode on the M16C/62
series of microcontrollers.
3. Memory Expansion Mode
There are three processor modes used with the M16C/62 series of microcontrollers. For each processor
mode, the memory map functions of some pins and external access space differ. The three processor
modes are as follows:
Single-chip mode—Only internal memory space can be accessed.
Memory Expansion mode—External memory can be accessed in addition to all the internal memory.
Microprocessor mode—External memory along with internal SFR and RAM areas can be accessed.
Internal ROM cannot be used.
For this application note, memory expansion mode is demonstrated. This allows use of all the internal
memory areas (SFR, RAM, ROM) and some external memory. In this mode, some of the pins need to
function as the address bus, data bus, and control signals for accessing the external memory. The
number of pins affected depends on the bus and register settings. Once expanded memory mode and
the control settings are selected, the affected pins become dedicated to external memory and can no
longer be used for other I/O.
The desired processor mode is set by the processor mode bits in the processor mode register (PM0) and
the CNVss pin. To select memory expansion mode, the CNVss pin is tied to Vss and the processor mode
bits are set to “01
2
”. When programming in C, the processor mode is set in the startup file (ncrt0.a30).
Figure 1 is an example for setting the processor mode bits.
AN-DECE-MCU-18-A
September 2001
1
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