XC886/888CLM
Flash Memory
User’s Manual
4-20
V1.3, 2010-02
Flash Memory, V 1.0
4.8.4
Flash Bank Read Status
Each call of the Flash bank read status subroutine allows the checking of ready-to-read
status of the Flash bank. Before calling this subroutine, the user must ensure that the
ACC SFR is set accordingly (see
4.8.5
P-Flash Parallel Read Enable/Disable
User can opt to disable the P-Flash parallel read feature by calling the parallel read
disable subroutine. A subroutine to enable the parallel read feature is also provided.
Table 4-4
Flash Bank Read Status Subroutine
Subroutine
DFF0
H
: FLASH_READ_STATUS
Input
ACC: Select desired Flash bank for ready-to-read status.
00
H
= P-Flash Bank Pair 0
01
H
= P-Flash Bank Pair 1
02
H
= P-Flash Bank Pair 2
03
H
= D-Flash Bank 0
04
H
= D-Flash Bank 1
Others = Invalid
1)
1)
For invalid ACC input, PSW.CY will be 0.
Output
PSW.CY:
0 = Flash bank is not in ready-to-read mode
1 = Flash bank is in ready-to-read mode
Stack size required
3 bytes
Resource
used/destroyed
ACC, PSW
Table 4-5
P-Flash Parallel Read Enable/Disable Subroutine
Subroutine
DFFC
H
: PARALLEL_READ_DISABLE;
DFFF
H
: PARALLEL_READ_ENABLE
Input
--
Output
--
Stack size required
3 bytes
Resource
used/destroyed
--
*
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