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Assembly Source for Algorithms
PRELIMINARY
A-6
PRELIMINARY
* programmed bits. For example, if the flash is programmed *
* using a CLKOUT period of 50 ns, the flash can be read back
* reliably over the CLKOUT period range of 50 ns to 150 ns *
* (6.67 MHz–20 MHz). The programming pulse-duration is *
* 100 us, and a maximum of 150 pulses is applied per row. *
* *
* The following resources are used for temporary storage: *
* AR0 Used for comparisons *
* AR1 Used for pgm pulse count *
* AR2 Used for row banz loop. *
* AR6 Parameter passed to Delay *
* FL_ADRS Used for flash address *
* FL_DATA Used for flash data. *
* FL_ST Used for flash start address *
* BASE_0 Used for row–done flag *
* BASE_1 Used for row start address *
* SPAD1 Flash commands *
* SPAD2 Flash commands *
* **
**************************************************************
.include ”svar20.h”
*
MAX_PGM .set 150 ;Only allow 150 pulses per row.
VER0 .set 010h ;VER0 command.
WR_CMND .set 4 ;Write command.
WR_EXE .set 045h ;Write EXEBIN command.
STOP .set 0 ;Reset command.
.def GCLR
.ref PROTECT,SEG_ST,SEG_END
.ref DELAY,REGS,ARRAY
.sect ”fl_clr”
*************************************************************
* GCLR: This routine performs a clear operation on the *
* flash array defined by the FL_ST variable. The segments *
* to be cleared are defined by the SEG_ST, SEG_END, and *
* PROTECT variables. *
* The following resources are used for temp storage: *
* AR0 Used for comparisons *
* AR1 Used for pgm pulse count *
* AR2 Used for row banz loop *
* FL_ADRS Used for flash address *
* FL_DATA Used for flash data *
* BASE_0 Used for row–done flag *
* BASE_1 Used for row start address *
* BASE_2 Used for byte mask. *
*************************************************************
GCLR:
SETC INTM ;Disable all ints.
CLRC SXM ;Disable sign extension.
SPLK #0,ERROR ;Reset error flag
LACL SEG_ST ;Get segment start address.
SACL FL_ADRS ;Save as current address.
AND #04000h ;Get array start address.