C8051F310 datasheet(116/228 Pages) SILABS

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C8051F310/1/2/3/4/5/6/7

116

Rev. 1.7

10. Make certain that the Flash write and erase pointer variables are not located in XRAM. See

your compiler documentation for instructions regarding how to explicitly locate variables in dif-

ferent memory areas.

11. Add address bounds checking to the routines that write or erase Flash memory to ensure that

a routine called with an illegal address does not result in modification of the Flash.

10.4.3. System Clock

12. If operating from an external crystal, be advised that crystal performance is susceptible to

electrical interference and is sensitive to layout and to changes in temperature. If the system is

operating in an electrically noisy environment, use the internal oscillator or use an external

CMOS clock.

13. If operating from the external oscillator, switch to the internal oscillator during Flash write or

erase operations. The external oscillator can continue to run, and the CPU can switch back to

the external oscillator after the Flash operation has completed.

Additional Flash recommendations and example code can be found in AN201, "Writing to Flash from Firm-

ware", available from the Silicon Laboratories web site.

SFR Definition 10.1. PSCTL: Program Store R/W Control

Bits7–2: UNUSED: Read = 000000b, Write = don’t care.

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.

R/W

Reset Value

PSEE

PSWE

00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Address:

0x8F

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