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SST89E554

Flash flex 51 MCU

Silicon Storage Technology 

FlashFlex51 MCU

SST89E564 / SST89V564 / SST89E554 / SST89V554

Preliminary Specifications

4.1.1 Product Identification

The Read-ID command accesses the Signature Bytes that

identify the device and the manufacturer as SST. External

programmers primarily use these Signature Bytes in the

selection of programming algorithms. The Read-ID com-

mand is selected by the command code of 0H on P3[7:6]

and P2[7:6]. See Figure 4-2 for timing waveforms.

Following is a detailed description of the External Host

Mode commands:

The Select-Block0 command enables Block 0 to be pro-

grammed in External Host Mode. Once this command is

executed, all subsequent External Host Commands will be

directed at Block 0. See Figure 4-3 for timing waveforms.

This command applies to SST89E564/SST89V564 only.

TABLE 4-3: SIGNATURE BYTES

Manufacturer’s ID

Device ID

SST89E564

SST89V564

SST89E554

SST89V554

Address

30H

31H

31H

31H

31H

Data

BFH

93H

92H

9BH

9AH

T4-3.4 384

The Select-Block1 command enables Block 1 (8 KByte

Block) to be programmed. Once this command is exe-

cuted, all subsequent External Host Commands that are

directed to the address range below 2000H will be directed

at Block 1. The Select-Block1 command only affects the

lowest 8 KByte of the program address space. For

addresses greater than or equal to 2000H, Block 0 is

accessed by default. Upon entering External Host Mode,

Block 1 is selected by default. See Figure 4-3 for timing

waveforms. This command applies to SST89E564/

SST89V564 only.

4.1.2 Arming Command

An arming command sequence must take place before

any External Host Mode sequence command is recog-

nized by the device. This prevents accidental triggering of

External Host Mode Commands due to noise or program-

mer error. The arming command is as follows:

1. PSEN# goes low while RST is high. This will get

the machine in External Host Mode, re-configuring

the pins, and turning on the on-chip oscillator.

2. A Read-ID command is issued, and after 1 ms the

External Host Mode commands can be issued.

After the above sequence, all other External Host Mode

commands are enabled. Before the Read-ID command is

received, all other External Host Mode commands

received are ignored.

4.1.3 Detail Explanation of the External Host Mode

Commands

The External Host Mode commands are Read-ID, Chip-

Erase, Block-Erase, Sector-Erase, Byte-Program, Byte-

Verify, Prog-SB1, Prog-SB2, Prog-SB3, Prog-SC0, Prog-

SC1, Select-Block0, Select-Block1. See Tables 4-1 and 4-2

for all signal logic assignments, Figure 4-1 for I/O pin

assignments, and Table 4-7 for the timing parameters. The

critical timing for all Erase and Program commands is gen-

erated by an on-chip flash memory controller. The high-to-

low transition of the PROG# signal initiates the Erase or

Program commands, which are synchronized internally.

The Read commands are asynchronous reads, indepen-

dent of the PROG# signal level.

The Chip-Erase, Block-Erase, and Sector-Erase com-

mands are used for erasing all or part of the memory

array. Erased data bytes in the memory array will be

erased to FFH. Memory locations that are to be pro-

grammed must be in the erased state prior to program-

ming.

The Chip-Erase command erases all bytes in both memory

blocks, regardless of any previous Select-Block0 or Select-

Block1 commands. Chip-Erase ignores the Security Lock

status and will erase the Security Lock, returning the device

to its Unlocked state. The Chip-Erase command will also

erase the SC0 bit. Upon completion of Chip-Erase com-

mand, Block 1 will be the selected block. See Figure 4-4 for

timing waveforms.

The Block-Erase command erases all bytes in the selected

memory blocks. This command will not be executed if the

security lock is enabled. The selection of the memory block

to be erased is determined by the prior execution Select-

Block0 or Select-Block1 command. See Figure 4-6 for the

timing waveforms.

The Sector-Erase command erases all of the bytes in a

sector. The sector size for the flash memory is 128 Bytes.

This command will not be executed if the Security lock is

enabled. See Figure 4-7 for timing waveforms.

The Byte-Program command is used for programming new

data into the memory array. Programming will not take

place if any security locks are enabled. See Figure 4-8 for

timing waveforms.

©2001 Silicon Storage Technology, Inc.

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