Datasheet

Table 4-25. Erase verify flash section command error handling

FSTAT

ACCERR

Set if CCOBIX[2:0] != 010 at command launch

Set if command not available in current mode (see Table 4-9)

Set if an invalid global address [23:0] is supplied (see Table 4-6)

Set if a misaligned long words address is supplied (global address[1:0] !=

00)

Set if the requested section crosses flash address boundary

FPVIOL None

MGSTAT1

Set if any errors have been encountered during the read

or if blank check

failed

MGSTAT0

Set if any non-correctable errors have been encountered during the read

or if blank check failed

1. As defined by the memory map for NVM

2. As found in the memory map for NVM

4.5.2.9.4 Read once command

The read once command provides read access to a reserved 64 byte field (8 phrase)

located in the nonvolatile information register of flash. The read once field can only be

programmed once and can not be erased. It can be used to store the product ID or any

other information that can be written only once. It is programmed using the program once

command described in Program once command. To avoid code runaway, the read once

command must not be executed from the flash block containing the program once

reserved field.

Table 4-26. Read once command FCCOB requirements

CCOBIX[2:0] FCCOB parameters

000 0x04 Not required

001 Read once phrase index (0x0000 – 0x0007)

010 Read once word 0 value

011 Read once word 1 value

100 Read once word 2 value

101 Read once word 3 value

Upon clearing FSTAT[CCIF] to launch the read once command, a read once phrase is

fetched and stored in the FCCOB indexed register. The FSTAT[CCIF] flag will set after

the read once operation has completed. Valid phrase index values for the read once

command range from 0x0000 to 0x0007. During execution of the read once command,

any attempt to read addresses within flash block will return invalid data.

Flash and EEPROM

MC9S08PA60 Reference Manual, Rev. 1, 9/2012

94 Freescale Semiconductor, Inc.