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参数资料
| 型号： | M306NAMGT-XXXFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件页数： | 143/294页 |
| 文件大小： | 2763K |
| 代理商： | M306NAMGT-XXXFP |
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Mitsubishi microcomputers
M16C / 6N0 / 6N1 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CPU Rewrite Mode (Flash Memory Version)
227
Outline Performance (CPU Rewrite Mode)
In the CPU rewrite mode, the CPU erases, programs and reads the internal flash memory as instructed by
software commands. Operations must be executed from a memory other than the internal flash memory,
such as the internal RAM.
When the CPU rewrite mode select bit (bit 1 at address 03B716) is set to "1", transition to CPU rewrite mode
occurs and software commands can be accepted.
In the CPU rewrite mode, write to and read from software commands and data into even numbered address
("0" for byte address A0) in 16 bit units. Always write 8 bit software commands into even numbered address.
Commands are ignored with odd numbered addresses.
Use software commands to control program and erase operations. Whether a program or erase operation
has terminated normally or in error can be verified by reading the status register.
Figure 1.24.1 shows the flash memory control register 0 and the flash memory control register 1.
_____
Bit 0 of the flash memory control register 0 is the RY/BY status flag used exclusively to read the operating
status of the flash memory. During programming and erase operations, it is "0". Otherwise, it is "1".
Bit 1 of the flash memory control register 0 is the CPU rewrite mode select bit. The CPU rewrite mode is
entered by setting this bit to "1", so that software commands become acceptable. In CPU rewrite mode, the
CPU becomes unable to access the internal flash memory directly. Therefore, write bit 1 in an area other
_______
than the internal flash memory. Also only when NMI pin is "H" level. To set this bit to "1", it is necessary to
write "0" and then write "1" in succession. The bit can be set to "0" by only writing a "0".
Bit 2 of the flash memory control register 0 is a lock bit disable select bit. By setting this bit to "1", it is
possible to disable erase and write protect (block lock) effectuated by the lock bit data. The lock bit disable
select bit only disables the lock bit function; it does not change the lock data bit value. However, if an erase
operation is performed when this bit is "1", the lock bit data that is "0" (locked) is set to "1" (unlocked) after
erasure. To set this bit to "1", it is necessary to write "0" and then write "1" in succession. This bit can be
manipulated only when the CPU rewrite mode select bit is "1".
Bit 3 of the flash memory control register 0 is the flash memory reset bit used to reset the control circuit of
the internal flash memory. This bit is used when exiting CPU rewrite mode and when flash memory access
has failed. When the CPU rewrite mode select bit is "1", writing "1" for this bit resets the control circuit. To
release the reset, it is necessary to set this bit to "0".
Bit 5 of the flash memory control register 0 is a user ROM area select bit which is effective in only boot
mode. If this bit is set to "1" in boot mode, the area to be accessed is switched from the boot ROM area to
the user ROM area. When the CPU rewrite mode needs to be used in boot mode, set this bit to "1". Note
that if the microcomputer is booted from the user ROM area, it is always the user ROM area that can be
accessed and this bit has no effect. When in boot mode, the function of this bit is effective regardless of
whether the CPU rewrite mode is on or off. Write to this bit only when executing out of an area other than
the internal flash memory.
Bit 3 of the flash memory control register 1 turns power supply to the internal flash memory on/off. When
this bit is set to "1", power is not supplied to the internal flash memory, thus power dissipation can be
reduced. However, in this state, the internal flash memory cannot be accessed. To set this bit to "1", it is
necessary to write "0" and then write "1" in succession. Use this bit mainly in the low speed mode (when
XCIN is the count source of BCLK).
When the CPU is shifted to the stop or wait modes, power to the internal flash memory is automatically shut
off. It is reconnected automatically when CPU operation is restored. Therefore, it is not particularly neces-
sary to set flash memory control register 1.
相关PDF资料 |
PDF描述 |
|---|---|
| M306NAFGTFP | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100 |
| M306NBMCT-XXXFP | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100 |
| M306NBMCV-XXXFP | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100 |
| M306NAMCV-XXXFP | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100 |
| M306NBMCV-XXXFP | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M306NKFHGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Renesas MCU |
| M306NKFHGP#U3 | 功能描述:IC M16C MCU FLASH 384K 100LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:M16C™ M16C/60/6NK 标准包装:1 系列:AVR® ATmega 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C，SPI，UART/USART 外围设备:欠压检测/复位，POR，PWM，WDT 输入/输出数:32 程序存储器容量:32KB（16K x 16） 程序存储器类型:闪存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:44-TQFP 包装:剪切带 (CT) 其它名称:ATMEGA324P-B15AZCT |
| M306NKFHTGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Renesas MCU |
| M306NKFHVGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Renesas MCU |
| M306NKFJGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Renesas MCU |
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