SST89E58RD2-40-I-TQJE Microchip Technology, SST89E58RD2-40-I-TQJE Datasheet - Page 13

• Manufacturer Part Number: SST89E58RD2-40-I-TQJE
• Description: 4.5 To 5.5V FlashFlex 8-bit 8051 Microcontroller 44 TQFP 10x10x1mm TRAY
• Manufacturer: Microchip Technology
• Series: FlashFlex®r

Specifications of SST89E58RD2-40-I-TQJE

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 36
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP
• Processor Series: FlashFlex51
• Core: C51
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 5
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

FlashFlex MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
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.
TABLE
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 4-2.
©2008 Silicon Storage Technology, Inc.
SFCF[1:0]
FIGURE
10, 11
01
00
3-1: SFCF Values for Program Memory Block Switching
FFFFH
0000H
3-2: Program Memory Organization for 32 KByte SST89E58RDxA
Program Memory Block Switching
Block 1 is not visible to the PC;
Block 1 is reachable only via in-application programming from E000H - FFFFH.
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.
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.
64 KByte
External
EA# = 0
DFFFH
FFFFH
7FFFH
1FFFH
E000H
8000H
2000H
0000H
SFCF[1:0] = 00
24 KByte
24 KByte
External
EA# = 1
8 KByte
8 KByte
Block 1
Block 0
Block 1
13
DFFFH
FFFFH
7FFFH
E000H
8000H
0000H
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.
SFCF[1:0] = 01
24 KByte
32 KByte
EA# = 1
External
8 KByte
Block 1
Block 0
FFFFH
7FFFH
8000H
0000H
SFCF[1:0] = 10, 11
32 KByte
32 KByte
EA# = 1
External
Block 0
1339 F03.0
S71339-02-000
Data Sheet
T3-1.0 1339
02/08