SST89E554 SST [Silicon Storage Technology, Inc], SST89E554 Datasheet - Page 24

• Manufacturer Part Number: SST89E554
• Description: FlashFlex51 MCU
• Manufacturer: SST [Silicon Storage Technology, Inc]

4.0 FLASH MEMORY PROGRAMMING
The device internal flash memory can be programmed or
erased using the following two methods:
•
•
4.1 External Host Programming Mode
External Host Programming Mode allows the user to pro-
gram the flash memory directly without using the CPU.
External Host Mode is entered by forcing PSEN# from a
TABLE
Note: Symbol
Note: V
©2001 Silicon Storage Technology, Inc.
Operation
Read-ID
Chip-Erase
Block-Erase
Sector-Erase
Byte-Program
Byte-Verify (Read)
Select-Block0
Select-Block1
Prog-SC0
Prog-SB1
Prog-SB2
Prog-SB3
External Host Mode
In-Application Programming (IAP) Mode
the above input pins are invalid and may result in unexpected behaviors.
AH = Address high order byte; DI = Data Input; DO = Data Output
IL
= Input Low Voltage;
4-1: E
signifies a negative pulse and the command is asserted during the low state of PROG#/ALE input. All other combinations of
XTERNAL
RST
V
V
V
V
V
V
V
V
V
V
V
V
IH1
IH1
IH1
IH1
IH1
IH1
IH1
IH1
IH1
IH1
IH1
IH1
V
H
IH
PSEN#
OST
= Input High Voltage;
V
V
V
V
V
V
V
V
V
V
V
V
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
IL
M
ODE
PROG#/
ALE
C
V
V
OMMANDS FOR
IH
IH
SST89E564 / SST89V564 / SST89E554 / SST89V554
V
IH1
EA#
V
V
V
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IH
IH
IH
IH
IH
IH
IH
= Input High Voltage (XTAL, RST); X = Don’t care; AL = Address low order byte;
P3[7]
V
V
V
V
V
V
V
V
V
V
V
V
SST89E564/SST89V564
24
IH
IH
IH
IH
IH
IH
IH
IH
IH
IL
IL
IL
logic high to a logic low while RST input is being held con-
tinuously high. The device will stay in External Host Mode
as long as RST = 1 and PSEN# = 0.
A Read-ID operation is necessary to “arm” the device in
External Host Mode, and no other External Host Mode com-
mands can be enabled until a Read-ID is performed. In
External Host Mode, the internal flash memory blocks are
accessed through the re-assigned I/O port pins (see Figure
4-1 for details) by an external host, such as a MCU program-
mer, a PCB tester or a PC-controlled development board.
P3[6]
V
V
V
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IL
IL
IL
IL
IL
Il
Il
P2[7]
V
V
V
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IL
IL
IL
IL
IL
IL
Il
Il
P2[6]
V
V
V
V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IH
IH
IH
IH
IL
IL
IL
IL
P0[7:0]
DO
DO
Preliminary Specifications
DI
X
X
X
X
X
X
X
X
X
FlashFlex51 MCU
P3[5:4]
P2[5:0]
A5H
5AH
55H
S71181-03-000 9/01
AH
AH
AH
AH
X
X
X
X
X
P1[7:0]
T4-1.4 384
AL
AL
AL
AL
X
X
X
X
X
X
X
X
384