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參數(shù)資料
| 型號： | SST89C58-33-I-TQJE |
| 廠商： | SILICON STORAGE TECHNOLOGY INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | LEAD FREE, TQFP-44 |
| 文件頁數(shù)： | 14/52頁 |
| 文件大?。?/td> | 967K |
| 代理商： | SST89C58-33-I-TQJE |
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Data Sheet
FlashFlex51 MCU
SST89C54 / SST89C58
21
2004 Silicon Storage Technology, Inc.
S71131-04-000
6/04
4.1.3 External Host Mode Commands
The twelve SST89C54/58 external host mode commands
are Read-ID, Chip-Erase, Block-Erase Sector-Erase, Byte-
Program, Burst-Program, Byte-Verify, Prog-SB1, Prog-
SB2, Prog-SB3, Prog-RB0 and Prog-RB1. See Table 4-1
for all signal logic assignments and Table 12-11 for the tim-
ing parameter for the external host mode commands. The
critical timing for all Erase and Program commands is self-
generated by the on-chip flash memory controller. The
high-to-low transition of the PROG# signal initiates the
Erase and Program commands, which are synchronized
internally. The Read commands are asynchronous reads,
independent of the PROG# signal level.
The following three commands are used for erasing all or
part of the memory array. Memory locations that are to be
programmed must be in the erased state (0FFH) prior to
programming.
The Chip-Erase command erases all bytes in both memory
blocks. This command ignores the Security Lock status
and will erase the Security bits and the RE-MAP bits. See
Figure 12-13 for timing waveforms.
The Block-Erase command erases all bytes in one of the
memory blocks (16/32KB or 4KB). This command will not
be enabled if the security lock is enabled on the selected
memory block. The selection of the memory block to be
erased is determined by A[15:12]. If A15 is a “0”, then the
primary flash memory Block 0 (16/32KB), is selected. If
A[15:12] = “1111b”, then the secondary flash memory
Block 1 (4KB) is selected. See Figure 12-14 for the timing
waveforms.
The Sector-Erase command erases all of the bytes in a
sector. The sector size for the primary flash memory
(Addresses 0000H-3FFFH/7FFFH) is 128 Bytes. The sec-
tor size for the secondary flash memory (Addresses
F000H-FFFFH) is 64 bytes. This command will not be exe-
cuted if the Security lock is enabled on the selected mem-
ory block. The selection of the memory sector to be erased
is determined by A[15:6] for Block 0 A[15:5] for Block 1.
See Figure 12-15 for timing waveforms.
The Byte-Program and Burst-Program commands are
used for programming new data into the memory array.
Selection of which Program command to use will be
dependent upon the desired programming field size. Pro-
gramming will not take place if any security locks are
enabled on the selected memory block.
The Byte-Program command programs data into a single
byte. See Figure 12-16 for timing waveforms.
The Burst-Program command programs data to an entire
row, sequentially byte-by-byte. See Figure 12-17 for timing
waveforms.
The Byte-Verify command allows the user to verify that the
SST89C54/58 correctly performed an Erase or Program
command. This command will be disabled if any security
locks are enabled on the selected memory block. See Fig-
ure 12-18 for timing waveforms.
The Prog-SB1, Prog-SB2, Prog-SB3 commands program
the security bits. The functions of these bits are described
in a Security Lock section and also in Table 8-1. Once pro-
grammed, these bits can only be erased through a Chip-
Erase command.
The Prog-RB1, and Prog-RB0 commands program the
RE-MAP[1:0] bits. The functions of these bits are described
in the Memory Re-mapping section and also in Table 3-1.
Once programmed, these bits can only be erased through
Chip-Erase command.
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