Datasheet

DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
9 of 43
Table 1. Special Function Register Locations
REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 ADDRESS
P0
P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 80h
SP
81h
DPL
82h
DPH
83h
DPL1
84h
DPH1
85h
DPS
0 0 0 0 0 0 0 SEL
86h
PCON
SMOD_0
SMOD0
— — GF1 GF0 STOP IDLE 87h
TCON
TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 88h
TMOD
GATE
C/T
M1 M0 GATE
C/T
M1 M0 89h
TL0
8Ah
TL1
8Bh
TH0
8Ch
TH1
8Dh
CKCON
WD1 WD0 T2M T1M T0M MD2 MD1 MD0
8Eh
PORT1
P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 90h
EXIF
IE5 IE4 IE3 IE
XT/RG
RGMD RGSL BGS
91h
SCON0
SM0/FE_0 SM1_0 SM2_0 REN_0 TB8_0 RB8_0 TI_0 RI_0 98h
SBUF0
99h
P2
P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 A0h
IE
EA ES1 ET2 ES0 ET1 EX1 ET0 EX0 A8h
SADDR0
A9h
SADDR1
AAh
P3
P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0 B0h
IP
— PS1 PT2 PS0 PT1 PX1 PT0 PX0 B8h
SADEN0
B9h
SADEN1
BAh
SCON1
SM0/FE_1 SM1_1 SM2_1 REN_1 TB8_1 RB8_1 TI_1 R1_1
C0h
SBUF1
SB7 SB6 SB5 SB4 SB3 SB2 SB1 SB0
C1h
ROMSIZE
— — — — —
RMS2 RMS1 RMS0
C2h
PMR
CD1 CD0 SWB — XTOFF ALEOFF DME1 DME0
C4h
STATUS
PIP HIP LIP XTUP SPTA1 SPTA1 SPTA0 SPRA0
C5h
TA
C7h
T2CON
TF2 EXF2 RCLK TCLK EXEN2 TR2
C/T2 C/RL2
C8h
T2MOD
— — — — — — T2OE DCEN C9h
RCAP2L
CAh
RCAP2H
CBh
TL2
CCh
TH2
CDh
PSW
CY AC F0 RS1 RS0 OV FL P D0h
WDCON
SMOD_1 POR EPFI PFI WDIF WTRF EWT RWT
D8h
ACC
E0h
EIE
— — —
EWDI EX5 EX4 EX3 EX2
E8h
B
F0h
EIP
— — —
PWDI PX5 PX4 PX3 PX2
F8h
Note: New functions are in bold.