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參數(shù)資料
| 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)： | 6/14頁 |
| 文件大?。?/td> | 831K |
| 代理商： | USING |
M16C/62
8 bits at a time. When A/D sampling stops, the results are read from external memory using 16-bit mode.
The data are split into two bytes and added together to calculate the average A/D value.
Using the Expanded Memory Mode with the M16C/62
Chip select 2 is used to address the memory. The effective address range using CS2 is 8000h to
27FFFh; this is a total of 128 Kbytes. Each memory chip in our demo contains 32k x 8 bits or 64 Kbytes
total memory (8000h – 17FFFh).
Figure 5. External Memory Connections
The potentiometer on the evaluation board is connected to A/D input AN0 on the M16C/62. The A/D is
set up for 8-bit conversion, one-shot mode, software triggered, with sample and hold enabled.
The push button (S2) used to start and stop the A/D sampling is connected to an external interrupt on the
M16/62. The interrupt used is INT0. Each time the push button is pressed, an INT0 interrupt is generated.
A flag monitors the A/D sampling when it is on or off.
The LCD supplied on the evaluation board views the A/D values as they are sampled and the average
A/D value when sampling is stopped. Because some of the LCD connections on the board are used for
control signals in expanded memory mode, some circuit modifications are needed for the LCD to work
with external memory. Figure 6 shows the LCD connections used in the sample program. This
configuration allows the LCD to be accessed similar to any external memory. Chip select 1 addresses the
LCD, thus writing to any even address (low byte in 16-bit address bus) in the CS1 memory area writes
AN-DECE-MCU-18-A
September 2001
5
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