
Philips Semiconductors
Product data
P8xC660X2/661X2
80C51 8-bit microcontroller family
16 KB OTP/ROM, 512B
RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33
MHz), two 400KB I
2
C interfaces
2003 Oct 02
53
DB
S1ADR
GC
S1DAT
0
0
CR0
CR!
SI
0
AA
ST0
STA
CR2
ENS1
SPECIAL FUNCTION REGISTERS
53
BACKUP
NUMBYTMST
INTERNAL DATA RAM
S1STA
S1CON
PSW
DA
D9
D8
D0
PS1
IPO
B8
IEN0
AB
ES1
EA
P1.7
P1.6
P1
90
80
7F
ORIGINAL VALUE OF NUMBYTMST
NUMBER OF BYTES AS MASTER
52
SLA
SLA+R/W TO BE TRANSMITTED TO SLA
51
HADD
HIGHER ADDRESS BYTE INTERRUPT ROUTINE
50
SLAVE TRANSMITTER DATA RAM
4F
STD
48
SLAVE RECEIVER DATA RAM
SRD
40
MASTER RECEIVER DATA RAM
MRD
38
MASTER TRANSMITTER DATA RAM
MTD
30
19
R1
R0
18
00
SU00978
Figure 29. SIO1 Data Memory Map