FlashFlex51 MCU
SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2
SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2
Preliminary Specifications
4.2.4.4 Byte-Program
The Byte-Program command programs data into a single
byte. The address is determined by the contents of SFAH
and SFAL. The data byte is in SFDT.
IAP Enable
ORL SFCF, #40H
Program byte address
MOV SFAH, #byte_addressH
MOV SFAL, #byte_addressL
IAP Enable
ORL SFCF, #40H
Program byte address
MOV SFAH, #byte_addressH
MOV SFAL, #byte_addressL
MOV SFCM, #0CH
SFDT register
contains data
Move data to SFDT
MOV SFDT, #data
1255 F12.0
4.2.4.6 Prog-SB3, Prog-SB2, Prog-SB1
Prog-SB3, Prog-SB2, Prog-SB1 commands are used to
program the security bits (see Table 9-1). Completion of
any of these commands, the security options will be
updated immediately.
Polling scheme
MOV SFCM, #0EH
Interrupt scheme
MOV SFCM, #8EH
Security bits previously in un-programmed state can be
programmed by these commands. Prog-SB3, Prog-SB2
and Prog-SB1 commands should only reside in Block 1 or
external code memory.
SFST[2] indicates
operation completion
INT1 interrupt
indicates completion
1255 F11.0
4.2.4.5 Byte-Verify
The Byte-Verify command allows the user to verify that the
device has correctly performed an Erase or Program com-
mand. Byte-Verify command returns the data byte in SFDT
if the command is successful. The user is required to check
that the previous flash operation has fully completed before
issuing a Byte-Verify. Byte-Verify command execution time
is short enough that there is no need to poll for command
completion and no interrupt is generated.
IAP Enable
ORL SFCF, #40H
Set-Up
MOV SFDT, #0AAH
Program SB1
MOV SFCM, #0FH
or
Program SB2
MOV SFCM, #03H
or
Program SB3
MOV SFCM, #05H
or
OR
OR
MOV SFCM, #8FH
MOV SFCM, #85H
MOV SFCM, #83H
Polling SFST[2]
indicates completion
INT1# Interrupt
indicates completion
1255 F13.0
©2004 Silicon Storage Technology, Inc.
S71255-00-000
3/04
41
SST [ SILICON STORAGE TECHNOLOGY, INC ]
