C8051F360/1/2/3/4/5/6/7/8/9
SFR Definition 13.1. PSCTL: Program Store Read/Write Control
SFR Page:
0
SFR Address: 0x8F
R/W
R/W
–
R/W
–
R/W
–
R/W
–
R/W
–
R/W
PSEE
Bit1
R/W
Reset Value
–
Bit7
PSWE 00000000
Bit0
Bit6
Bit5
Bit4
Bit3
Bit2
Bits 7–2: UNUSED. Read = 000000b, Write = don't care.
Bit 1: PSEE: Program Store Erase Enable.
Setting this bit allows an entire page of the Flash program memory to be erased provided
the PSWE bit is also set. After setting this bit, a write to Flash memory using the MOVX
instruction will erase the entire page that contains the location addressed by the MOVX
instruction. The value of the data byte written does not matter. Note: The Flash page con-
taining the Read Lock Byte and Write/Erase Lock Byte cannot be erased by software.
0: Flash program memory erasure disabled.
1: Flash program memory erasure enabled.
Bit 0:
PSWE: Program Store Write Enable.
Setting this bit allows writing a byte of data to the Flash program memory using the MOVX
write instruction. The location must be erased prior to writing data.
0: Write to Flash program memory disabled. MOVX write operations target External RAM.
1: Write to Flash program memory enabled. MOVX write operations target Flash memory.
SFR Definition 13.2. FLKEY: Flash Lock and Key
SFR Page:
0
SFR Address: 0xB7
R/W
R/W
R/W
Bit5
R/W
Bit4
R/W
Bit3
R/W
Bit2
R/W
Bit1
R/W
Bit0
Reset Value
00000000
Bit7
Bit6
Bits 7–0: FLKEY: Flash Lock and Key Register
Write:
This register provides a lock and key function for Flash erasures and writes. Flash writes
and erases are enabled by writing 0xA5 followed by 0xF1 to the FLKEY register. Flash
writes and erases are automatically disabled after the next write or erase is complete. If any
writes to FLKEY are performed incorrectly, or if a Flash write or erase operation is attempted
while these operations are disabled, the Flash will be permanently locked from writes or era-
sures until the next device reset. If an application never writes to Flash, it can intentionally
lock the Flash by writing a non-0xA5 value to FLKEY from software.
Read:
When read, bits 1-0 indicate the current Flash lock state.
00: Flash is write/erase locked.
01: The first key code has been written (0xA5).
10: Flash is unlocked (writes/erases allowed).
11: Flash writes/erases disabled until the next reset.
142
Rev. 1.0
SILICON [ SILICON ]
