SST89V54RD2 Silicon Storage Technology, Inc., SST89V54RD2 Datasheet - Page 35

• Manufacturer Part Number: SST89V54RD2
• Description: Flashflex51 Mcu
• Manufacturer: Silicon Storage Technology, Inc.

FlashFlex MCU
SST89V54RD2/RD / SST89V58RD2/RD
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.
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.
©2007 Silicon Storage Technology, Inc.
FIGURE
operation completion
MOV SFCM, #0EH
SFST[2] indicates
Polling scheme
4-4: Byte-Program
MOV SFAH, #byte_addressH
MOV SFAL, #byte_addressL
Program byte address
Move data to SFDT
MOV SFDT, #data
ORL SFCF, #40H
IAP Enable
indicates completion
MOV SFCM, #8EH
Interrupt scheme
INT1 interrupt
1255 F11.0
35
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.
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.
FIGURE
FIGURE
MOV SFCM, #0FH
MOV SFCM, #8FH
Program SB1
or
indicates completion
Polling SFST[2]
4-5: Byte-Verify
4-6: Prog-SB3, Prog-SB2, Prog-SB1
MOV SFAH, #byte_addressH
MOV SFAL, #byte_addressL
OR
Program byte address
MOV SFCM, #0CH
ORL SFCF, #40H
SFDT register
contains data
MOV SFDT, #0AAH
IAP Enable
MOV SFCM, #03H
MOV SFCM, #83H
ORL SFCF, #40H
Program SB2
IAP Enable
Set-Up
or
indicates completion
INT1# Interrupt
1255 F12.0
OR
S71255-10-000
MOV SFCM, #05H
MOV SFCM, #85H
Program SB3
Data Sheet
or
1255 F13.0
12/07