Other Flash Module Features; Functional Description; Modes Of Operation; Wait Mode - NXP Semiconductors MC9S08SU16 Reference Manual

Functional description

• Fast sector erase and longword program operation
• Flexible protection scheme to prevent accidental programming or erasing of flash
memory

11.2.2 Other flash module features

The flash memory module has the following other features:
• No external high-voltage power supply required for flash memory program and erase
operations
• Interrupt generation on flash command completion and flash error detection
• Security mechanism to prevent unauthorized access to the flash memory
11.3 Functional description

11.3.1 Modes of operation

The flash memory module provides the normal user mode of operation. The operating
mode is determined by module-level inputs and affects the FPROT, FCNFG, and
FCLKDIV registers.

11.3.1.1 Wait mode

The flash memory module is not affected if the MCU enters Wait mode. The flash
module can recover the MCU from Wait via the CCIF interrupt. See

11.3.1.2 Stop mode

If a flash command is active, that is, FSTAT[CCIF] = 0, when the MCU requests Stop
mode, the current NVM operation will be completed before the MCU is allowed to enter
Stop mode.

11.3.2 Flash block read access

If a flash block is read during execution of a command (while FSTAT[CCIF] = 0), the
read operation will return invalid data and it will trigger a illegal access exception in the
MCU.
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MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Flash interrupts.
NXP Semiconductors