FLASH Memory (FLASH)

2.8.4 FLASH Program Operation

Use the following step-by-step procedure to program a row of FLASH memory. Figure 2-4shows a flowchart of the programming algorithm.

NOTE

Only bytes which are currently $FF may be programmed.

1.Set the PGM bit. This configures the memory for program operation and enables the latching of address and data for programming.

2.Read the FLASH block protect register.

3.Write any data to any FLASH location within the address range desired.

4.Wait for a time, tNVS (minimum 10 ∝s).

5.Set the HVEN bit.

6.Wait for a time, tPGS (minimum 5 ∝s).

7.Write data to the FLASH address being programmed(1).

8.Wait for time, tPROG (minimum 30 ∝s).

9.Repeat step 7 and 8 until all desired bytes within the row are programmed.

10.Clear the PGM bit(1).

11.Wait for time, tNVH (minimum 5 ∝s).

12.Clear the HVEN bit.

13.After time, tRCV (typical 1 ∝s), the memory can be accessed in read mode again.

NOTE

The COP register at location $FFFF should not be written between steps 5-12, when the HVEN bit is set. Since this register is located at a valid FLASH address, unpredictable behavior may occur if this location is written while HVEN is set.

This program sequence is repeated throughout the memory until all data is programmed.

NOTE

Programming and erasing of FLASH locations cannot be performed by code being executed from the FLASH memory. While these operations must be performed in the order shown, other unrelated operations may occur between the steps. Do not exceed tPROG maximum, see 19.6 FLASH Memory Characteristics.

1.The time between each FLASH address change, or the time between the last FLASH address programmed to clearing PGM bit, must not exceed the maximum programming time, tPROG maximum.

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

41

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Freescale Semiconductor MC68HC908MR16 manual Flash Program Operation, Only bytes which are currently $FF may be programmed
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MC68HC908MR16, MC68HC908MR32 specifications

Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are part of the popular HC08 family, designed primarily for embedded applications. These microcontrollers are particularly favored in automotive, industrial, and consumer product sectors due to their reliability and versatility.

One of the standout features of the MC68HC908MR series is its CMOS technology, which enhances performance while minimizing power consumption. This makes these microcontrollers suitable for battery-operated devices. They operate at a maximum clock frequency of 2 MHz and offer a 16-bit architecture, providing a solid balance between processing power and efficiency.

The MC68HC908MR32 variant is equipped with 32KB of flash memory, which allows for the storage of complex programs and extensive data handling. In contrast, the MC68HC908MR16 features 16KB of flash memory, making it ideal for simpler applications. Both microcontrollers also come with 1KB of RAM, enabling efficient data processing and real-time operations.

Another significant characteristic of these microcontrollers is their integrated peripherals. They come with multiple input/output (I/O) pins, which allow for connectivity with various sensors and actuators. The built-in timer systems offer precise timing control for automotive and industrial applications, while the Analog-to-Digital Converter (ADC) provides essential conversion capabilities for various analog signals.

For communication purposes, the MC68HC908MR series includes a serial communication interface, enabling easy integration with other devices and systems. This versatility facilitates the development of complex systems that require interaction with external components.

Security is another crucial aspect of these microcontrollers. They have built-in fail-safe mechanisms to ensure reliable operation under various conditions, making them suitable for critical systems. Additionally, their robust architecture helps to safeguard against potential disruptions or attacks.

In summary, Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are key players in the embedded systems landscape. Their blend of power efficiency, integrated features, and scalability ensures they remain relevant for a wide array of applications, making them a favored choice among engineers and developers looking for dependable solutions in a competitive market.
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