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| 型號(hào)： | USING |
| 英文描述： | Using the Expanded Memory Mode with the M16C/62 |
| 中文描述： | 使用帶有擴(kuò)展內(nèi)存雙隨機(jī)PWM模式 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 831K |
| 代理商： | USING |
M16C/62
5. Implementation
Using the Expanded Memory Mode with the M16C/62
A sample program is included to demonstrate the use of expanded memory mode. This program is
written to run on Mitsubishi’s MDECE0620 evaluation board. This board allows easy evaluation for any
M16C/62 microcontroller. More information on this evaluation board can be found at
www.mdece.com
.
The example program samples the voltage of a potentiometer on the evaluation board and stores this
data into the external SRAM on the board. The potentiometer is connected to channel 0 of the A/D
converter on the M16C. When the push button S2 is pushed, the A/D value is sampled about every
100 ms and written to the SRAM one byte at a time. An LED (D6) blinks to indicate when the A/D is
sampling. When the push button is pressed again, the A/D sampling will stop, all of the A/D data stored in
memory is read back, and an average A/D value is calculated. Each time the A/D sampling is started, it
returns to the beginning of memory and starts storing data. For simplicity, the sample program is limited
to storing a total of 8 kbytes of data.
example of A/D data stored in the external SRAM on the evaluation board. A/D data storage starts at memory address 8000h. The average A/D value (after sampling is stopped) is also found in the memory
window at the average variable address or by using a C watch window.
Figure 4. PD30 Memory Window
The external memory connections used on the evaluation board and for the sample program are shown
in Figure 5. The memory is connected using the 16-bit data bus; the lower byte is connected to one
memory chip and the upper byte is connected to the second memory chip. The R/W mode is set to use
RD, WRL, and WRH. WRL is connected to the lower byte and WRH to the upper byte. With this
configuration, address line A0 is not connected to the external memory because WRL and WRH
effectively take its place. It is important to make sure that any unused control signals are tied off properly.
[Not shown: The RDY and Hold pins are connected to Vcc.]
The sample program accesses the memory in both 8-bit and 16-bit modes. Although the memory chips
are configured for a 16-bit data bus, the A/D results are 8-bit and writes to the external memory are done
AN-DECE-MCU-18-A
September 2001
4
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