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): 13/52頁
文件大?。?/td> 967K
代理商: SST89C58-33-I-TQJE
20
Data Sheet
FlashFlex51 MCU
SST89C54 / SST89C58
2004 Silicon Storage Technology, Inc.
S71131-04-000
6/04
FIGURE
4-1: I/O PIN ASSIGNMENTS FOR EXTERNAL HOST MODE
4.1.1 Product Identification
The Read-ID command accesses the signature bytes that
identify the device as an SST89C54/58 and the manufac-
turer as SST (See Table 4-2). External programmers pri-
marily use these signature bytes in the selection of
programming algorithms. The Read-ID command is
selected by the byte code of 00H on P2[7:6] and P3[7:6].
See Figure 12-12 for timing waveforms.
4.1.2 Arming Command
An arming command sequence must take place before
any external host mode sequence command is recognized
by the SST89C54/58. 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 set the
device in external host mode, re-configuring the pins.
2. A Read-ID command is issued and held for 1 ms.
After the above sequence, all other external host mode
commands are enabled. Before the Read-ID command is
received, all other External Host commands received are
ignored.
Flash
Control Signals
Address Bus
A7-A0
Flash
Control Signals
Address Bus
A13-A8
Input/
Output
Data
Bus
Port 0
VSS
XTAL1
XTAL2
Busy/Ready
Port 3
VDD RST
Port 2
Port 1
EA#
ALE /
PROG#
PSEN#
7
6
5
A15
A14
4
3
2
1
0
7
6
7
6
5
4
3
2
1
0
7
6
0
Address Bus
A15-A14
1131 F07.0
TABLE
4-2: PRODUCT IDENTIFICATION
Address
Data
Manufacturer’s ID
30H
BFH
Device ID
SST89C54
31H
E4H
SST89C58
31H
E2H
T4-2.2 1131
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