FlashFlex51 MCU
SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2
SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2
Preliminary Specifications
4.2.4.7 Prog-SC0, Prog-SC1
Prog-SC0 command is used to program the SC0 bit. This
command only changes the SC0 bit and has no effect on
BSEL bit until after a reset cycle.
IAP Enable
ORL SFCF, #40H
Set-up Enable-Clock-Double
MOV SFAH, #55H
SC0 bit previously in un-programmed state can be pro-
grammed by this command. The Prog-SC0 command
should reside only in Block 1 or external code memory.
MOV SFDT, #0AAH
Prog-SC1 command is used to program the SC1 bit. This
command only changes the SC1 bit and has no effect on
SFCF[1] bit until after a reset cycle.
Program Enable-Clock-Double
Program Enable-Clock-Double
Interrupt scheme
Polling scheme
MOV SFCM, #08H
MOV SFCM, #88H
SC1 bit previously in un-programmed state can be pro-
grammed by this command. The Prog-SC1 command
should reside only in Block 1 or external code memory.
Polling SFST[2]
indicates completion
INT1# Interrupt
indicates completion
1255 F15.0
IAP Enable
ORL SFCF, #40H
There are no IAP counterparts for the external host com-
mands Select-Block0 and Select-Block1.
4.2.5 Polling
Set-up Program SC0
MOV SFAH, #5AH
MOV SFDT, #0AAH
Set-up Program SC1
MOV SFAH, #0AAH
MOV SFDT, #0AAH
A command that uses the polling method to detect flash
operation completion should poll on the FLASH_BUSY bit
(SFST[2]). When FLASH_BUSY de-asserts (logic 0), the
device is ready for the next operation.
MOVC instruction may also be used for verification of the
Programming and Erase operation of the flash memory.
MOVC instruction will fail if it is directed at a flash block that
is still busy.
Program SC0 or SC1 -
Polling scheme
MOV SFCM, #09H
Program SC0 or SC1 -
Interrupt scheme
MOV SFCM, #89H
4.2.6 Interrupt Termination
Polling SFST[2]
indicates completion
INT1# Interrupt
indicates completion
If interrupt termination is selected, (SFCM[7] is set), then
an interrupt (INT1) will be generated to indicate flash opera-
tion completion. Under this condition, the INT1 becomes an
internal interrupt source. The INT1# pin can now be used
as a general purpose port pin and it cannot be the source
of External Interrupt 1 during in-application programming.
1255 F14.0
4.2.4.8 Enable-Clock-Double
Enable-Clock-Double command is used to make the MCU
run at 6 clocks per machine cycle. The standard (default) is
12 clocks per machine cycle (i.e. clock double command
disabled).
In order to use an interrupt to signal flash operation termi-
nation. EX1 and EA bits of IE register must be set. The IT1
bit of TCON register must also be set for edge trigger
detection.
.
©2004 Silicon Storage Technology, Inc.
S71255-00-000
3/04
42
SST [ SILICON STORAGE TECHNOLOGY, INC ]
