Datasheet

EEPROM 4K
MC9S12DP256 — Revision 1.1
EEPROM 4K
ESTAT Ñ EEPROM
Status Register
Read: Anytime
Write: Anytime to clear flags
The bits in this register are set by various conditions.
CBEIF — Command Buffer Empty Interrupt Flag
Indicates that the address, data and command buffer are empty so
that a new command sequence can be started. The flag is cleared by
writing a “1”. By clearing the flag the command sequence is launched.
Writing a “0” aborts a command sequence that has not yet been
launched and sets the ACCERR flag.
1 = Buffers are ready to accept a new command
0 = Buffers are full
CCIF — Command Complete Interrupt Flag
Indicates that there are no more commands pending. The flag is
cleared by hardware. Writing has no effect.
1 = All commands are completed
0 = Command in progress
PVIOL — Protection violation
Indicates an attempt was made to program or erase an address in a
protected memory area. A subsequent program or erase command
cannot executed while this flag is set. The flag is cleared by writing a
“1”. Writing a “0” has no effect. The flag is also cleared by writing a
new, valid command after CBEIF is cleared or when CCIF is clear.
1 = A protection violation has occurred.
0 = No violation occurred
Address Offset: $0005
Bit 7 654321Bit 0
Read:
CBEIF
CCIF
PVIOL ACCERR
0
BLANK
00
Write:
Reset: 11000000
= Reserved or unimplemented
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Freescale Semiconductor, Inc.
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