mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 104

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 3 2 Kbyte EEPROM Module (EETS2KV1)
3.3.2.7
The ECMD register defines the EEPROM commands.
CMDB6, CMDB5, CMDB2, and CMDB0 bits are readable and writable during a command sequence
while bits 7, 4, 3, and 1 read 0 and are not writable.
104
CMDB[6:5]
ACCERR
6, 5, 2, 0
CMDB2
CMDB0
BLANK
Reset
DONE
Field
Field
FAIL
4
2
1
0
W
R
EEPROM Access Error — The ACCERR flag indicates an illegal access to the selected EEPROM array
(Section 3.4.1.4, “Illegal EEPROM
an illegal command (illegal combination of the CMDBx bits in the ECMD register) or the execution of a CPU
STOP instruction while a command is executing (CCIF = 0). The ACCERR flag is cleared by writing a 1 to
ACCERR. Writing a 0 to the ACCERR flag has no effect on ACCERR. While ACCERR is set, it is not possible to
launch another command in the EEPROM.
0 No failure
1 Access error has occurred
Array Has Been Verified as Erased — The BLANK flag indicates that an erase verify command has checked
the EEPROM array and found it to be erased. The BLANK flag is cleared by hardware when CBEIF is cleared
as part of a new valid command sequence. Writing to the BLANK flag has no effect on BLANK.
0 If an erase verify command has been requested and the CCIF flag is set, then a 0 in BLANK indicates array
1 EEPROM array verifies as erased
Flag Indicating a Failed EEPROM Operation — The FAIL flag will set if the erase verify operation fails
(EEPROM block verified as not erased). The FAIL flag is cleared writing a 1 to FAIL. Writing a 0 to the FAIL flag
has no effect on FAIL.
0 EEPROM operation completed without error
1 EEPROM operation failed
Flag Indicating a Completed EEPROM Operation
0 EEPROM operation is active (program, erase, erase verify)
1 EEPROM operation not active
EEPROM Command — Valid EEPROM commands are shown in
those mentioned in
EEPROM Command Register (ECMD)
7
0
0
is not erased
= Unimplemented or Reserved
CMDB6
6
0
Figure 3-11. EEPROM Command Register (ECMD)
Table 3-7. ESTAT Field Descriptions (continued)
Table 3-9
Table 3-8. ECMD Field Descriptions
CMDB5
MC9S12HZ256 Data Sheet, Rev. 2.05
sets the ACCERR bit in the ESTAT register.
5
0
Operations). This can be either a violation of the command sequence, issuing
4
0
0
Description
Description
3
0
0
Table
CMDB2
3-9. Any other command written than
2
0
Freescale Semiconductor
1
0
0
CMDB0
0
0