C8051F320-TB Silicon Laboratories Inc, C8051F320-TB Datasheet - Page 112
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C8051F320-TB
Manufacturer Part Number
C8051F320-TB
Description
BOARD PROTOTYPING W/C8051F320
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F320-TB
Contents
Board
Processor To Be Evaluated
C8051F320/F321
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F320
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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C8051F320/1
112
Bits7–3: Unused: Read = 00000b. Write = don’t care.
Bit2:
Bit1:
Bit0:
Bits7–0: FLKEY: Flash Lock and Key Register
R/W
Bit7
R/W
Bit7
-
Reserved. Read = 0b. Must Write = 0b.
PSEE: Program Store Erase Enable
Setting this bit (in combination with PSWE) allows an entire page of Flash program memory
to be erased. If this bit is logic 1 and Flash writes are enabled (PSWE is logic 1), a write to
Flash memory using the MOVX instruction will erase the entire page that contains the loca-
tion addressed by the MOVX instruction. The value of the data byte written does not matter.
0: Flash program memory erasure disabled.
1: Flash program memory erasure enabled.
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 Flash location should be erased before writing data.
0: Writes to Flash program memory disabled.
1: Writes to Flash program memory enabled; the MOVX write instruction targets Flash
memory.
Write:
This register must be written to before Flash writes or erases can be performed. Flash
remains locked until this register is written to with the following key codes: 0xA5, 0xF1. The
timing of the writes does not matter, as long as the codes are written in order. The key codes
must be written for each Flash write or erase operation. Flash will be locked until the next
system reset if the wrong codes are written or if a Flash operation is attempted before the
codes have been written correctly.
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.
SFR Definition 11.1.
R/W
Bit6
R/W
Bit6
-
SFR Definition 11.2.
R/W
Bit5
R/W
Bit5
-
R/W
Bit4
R/W
Bit4
-
PSCTL: Program Store R/W Control
FLKEY: Flash Lock and Key
Rev. 1.4
R/W
Bit3
R/W
Bit3
-
Reserved
R/W
Bit2
R/W
Bit2
PSEE
R/W
Bit1
R/W
Bit1
PSWE
R/W
Bit0
R/W
Bit0
SFR Address:
SFR Address:
00000000
Reset Value
00000000
Reset Value
0x8F
0xB7
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