參數(shù)資料
型號(hào)： SST89E554A-40-C-NJ
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, 40 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, MS-018AC, LCC-44
文件頁數(shù)： 4/87頁
文件大?。?/td> 996K
代理商： SST89E554A-40-C-NJ
12
Preliminary Specifications
FlashFlex51 MCU
SST89E554A / SST89V554A
2003 Silicon Storage Technology, Inc.
S71228-00-000
6/03
3.2 Program Memory Block Switching
The program memory block switching feature of the device allows either Block 1 or the lowest 8 KByte of Block 0 to be
used for the lowest 8 KByte of the program address space. SFCF[1:0] controls program memory block switching.
3.2.1 Reset Configuration of Program Memory
Block Switching
Program memory block switching is initialized after reset
according to the state of the Start-up Configuration bit SC0
and/or SC1. The SC0 and SC1 bits are programmed via
an external host mode command or an IAP Mode com-
mand. See Table 4-1 and Table 4-4.
Once out of reset, the SFCF[0] bit can be changed dynam-
ically by the program for desired effects. Changing SFCF[0]
will not change the SC0 bit.
Caution must be taken when dynamically changing the
SFCF[0] bit. Since this will cause different physical memory
to be mapped to the logical program address space. The
user must avoid executing block switching instructions
within the address range 0000H to 1FFFH.
3.3 Data RAM Memory
The data RAM has 1024 bytes of internal memory. The
RAM can be addressed up to 64KB for external data
memory.
TABLE
3-1: SFCF VALUES FOR PROGRAM MEMORY BLOCK SWITCHING
SFCF[1:0]
Program Memory Block Switching
10, 11
Block 1 is not visible to the PC;
Block 1 is reachable only via in-application programming from E000H - FFFFH.
01
Both Block 0 and Block 1 are visible to the PC.
Block 0 is occupied from 0000H - 7FFFH. Block 1 is occupied from E000H - FFFFH.
00
Block 1 is overlaid onto the low 8K of the program address space; occupying address locations 0000H - 1FFFH.
When the PC falls within 0000H - 1FFFH, the instruction will be fetched from Block 1 instead of Block 0.
Outside of 0000H - 1FFFH, Block 0 is used. Locations 0000H - 1FFFH of Block 0 are reachable through
in-application programming.
T3-1.0 1228
TABLE
3-2: SFCF VALUES UNDER DIFFERENT
RESET CONDITIONS
SC11
1. P = Programmed (Bit logic state = 0),
U = Unprogrammed (Bit logic state = 1)
State of SFCF[1:0] after:
Power-on
or
External
Reset
WDT Reset
or
Brown-out
Reset
Software
Reset
U (1)
00
(default)
x0
10
U (1)
P (0)
01
x1
11
P (0)
U (1)
10
P (0)
11
T3-2.0 1228
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