SAB88C166 Datasheet, PDF(21/58 Page) Siemens Semiconductor Group – 16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM

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SAB88C166 Datasheet, PDF (21/58 Pages) Siemens Semiconductor Group – 16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM

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SAB 88C166(W)

q Load source values and initialize loop counter (PCOUNT) with the maximum number of

programming trials (PNmax) to be performed before exiting the routine with a failure. Each trial

means applying a pulse of 100 Âµs to the selected words in the Flash memory. According to the

maximum cumulated programming time of 2.5 ms allowed per cell, PNmax must be â25â here.

The doubleword at memory location [SRC_PTR] is loaded into two auxiliary registers DATAWR1

and DATAWR2.

q Program one doubleword stored in the auxiliary data registers to the Flash memory location

[FLASH_PTR]. FLASH_PTR is not incremented here, since in 32-bit programming mode the

hardware automatically arranges the two data words correctly. The execution of the second write

instruction automatically starts the programming of the entire double word.

This instruction sequence must not be interrupted.

MOV

[FLASH_PTR], DATAWR1

[FLASH_PTR], DATAWR2

; Write low word to Flash

; Write high word to Flash, starts programming

q Wait until programming time elapsed (100 Âµs in this example), which depends on bit field

CKCTL in the FCR register and on the CPU clock frequency. End of programming is detected by

polling the FBUSY flag in the FCR register. The Flash memory switches to PVM mode

automatically.

WAIT_PROG:

MOV R15, DPP1: pof FCR

R15.2, WAIT_PROG

â¦

; Polling Loop to check bit FBUSY

; Read FCR contents using 16-bit access

; Loop while bit FBUSY (FCR.2) is â1â

; Continue in PVM mode, when FBUSY is â0â

q Verify VPP validity during programming to make sure VPP did not exceed its valid margins

during the programming operation. Otherwise programming may have not been performed

properly. The FCVPP flag is set to â1â in case of this error condition. If FCVPP reads â1â, the

programming routine can abort, when VPP still fails, or repeat the programming operation, when

VPP proves to be stable now.

Semiconductor Group

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