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ISD91200 Series Technical Reference Manual
Release Date: Sep 16, 2019
- 366 -
Revision 2.4
6.10 Register Description
ISP Control Register (FMC_ISPCTL)
The FMC_ISPCTL register is a protected register, user must first follow the unlock sequence
to gain
access.
Register
Offset
R/W
Description
Reset Value
FMC_ISPCTL
0x00
R/W
ISP Control Register
0x0002_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
CACHEDIS
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
ISPFF
LDUEN
CFGUEN
APUWEN
Reserved
BS
ISPEN
Table 6-6 ISP Control Register (FMC_ISPCTL, address 0x5000_C000)
Bits
Description
[31:22]
Reserved
Reserved.
[21]
CACHEDIS
Cache Disable
When set to 1, caching of flash memory reads is disabled.
[18:8]
Reserved
Reserved.
[6]
ISPFF
ISP Fail Flag
This bit is set by hardware when a triggered ISP meets any of the following
conditions:
(1) APROM writes to itself.
(2) LDROM writes to itself.
(3) Destination address is illegal, such as over an available range.
Write 1 to clear.
[5]
LDUEN
LDROM Update Enable
LDROM update enable bit.
0 = LDROM cannot be updated.
1 = LDROM can be updated when the MCU runs in APROM.
[4]
CFGUEN
CONFIG Update Enable
0 = Disable.
1 = Enable.
When enabled, ISP functions can access the CONFIG address space and modify
device configuration area.
[3]
APUWEN
APU Write Enable
1 = APROM write to itself.
0 = APROM can’t write itself. ISPFF with “1”