Data Sheet
FlashFlex51 MCU
SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD
SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD
17
©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06
TABLE 3-5: CPU related SFRs
Symbol Description
Direct
Address
Bit Address, Symbol, or Alternative Port Function
Reset
ValueMSB LSB
ACC
1
Accumulator E0H ACC[7:0] 00H
B
1
B Register F0H B[7:0] 00H
PSW
1
Program Status
Word
D0H CY AC F0 RS1 RS0 OV F1 P 00H
SP Stack Pointer 81H SP[7:0] 07H
DPL Data Pointer
Low
82H DPL[7:0] 00H
DPH Data Pointer
High
83H DPH[7:0] 00H
IE
1
Interrupt Enable A8H EA EC ET2 ES ET1 EX1 ET0 EX0 00H
IEA
1
Interrupt
Enable A
E8H - - - - EBO - - - xxxx0xxxb
IP
1
Interrupt Priority
Reg
B8H - PPC PT2 PS PT1 PX1 PT0 PX0 x0000000b
IPH Interrupt Priority
Reg High
B7H - PPCH PT2H PSH PT1H PX1H PT0H PX0H x0000000b
IP1
1
Interrupt Priority
Reg A
F8H - - - - PBO PX3 PX2 - xxxx0xxxb
IP1H Interrupt Priority
Reg A High
F7H - - - - PBOH PX3H PX3 - xxxx0xxxb
PCON Power Control 87H SMOD1 SMOD0 BOF POF GF1 GF0 PD IDL 00010000b
AUXR Auxiliary Reg 8EH - - - - - - EXTRAM AO xxxxxxx00b
AUXR1 Auxiliary Reg 1 A2H - - - - GF2 0 - DPS xxxx00x0b
XICON
2
External
Interrupt Control
AEH X EX3 IE3 IT3 0 EX2 IE2 IT2 00H
T3-5.0 1255
1. Bit Addressable SFRs
2. X = Don’t care
TABLE 3-6: Flash Memory Programming SFRs
Symbol Description
Direct
Address
Bit Address, Symbol, or Alternative Port Function
Reset
ValueMSB LSB
SFCF SuperFlash
Configuration
B1H - IAPEN - - - - SWR BSEL x0xxxx00b
SFCM SuperFlash
Command
B2H FIE FCM[6:0] 00H
SFAL SuperFlash
Address Low
B3H SuperFlash Low Order Byte Address Register - A
7
to A
0
(SFAL) 00H
SFAH SuperFlash
Address High
B4H SuperFlash High Order Byte Address Register - A
15
to A
8
(SFAH) 00H
SFDT SuperFlash
Data
B5H SuperFlash Data Register 00H
SFST SuperFlash
Status
B6H SB1_i SB2_i SB3_i - EDC_i FLASH_BUSY - - 000x00xxb
T3-6.0 1255
