Silicon Laboratories C8051F341 SFR Definition 12.1. Psctl Program Store R/W Control, Pswe

C8051F340/1/2/3/4/5/6/7

SFR Definition 12.1. PSCTL: Program Store R/W Control

R/W		R/W	R/W	R/W	R/W	R/W	R/W	R/W	Reset Value
-		-	-	-	-	Reserved	PSEE	PSWE	00000000
Bit7		Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0	SFR Address:
									0x8F
Bits7–3:	Unused: Read = 00000b. Write = don’t care.
Bit2:	Reserved. Read = 0b. Must Write = 0b.
Bit1:	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.
Bit0:	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.

SFR Definition 12.2. FLKEY: Flash Lock and Key

R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W	Reset Value
								00000000
Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0	SFR Address:
								0xB7

Bits–0: FLKEY: Flash Lock and Key Register 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.

114 Rev. 0.5