Philips Semiconductors
Preliminary specification
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
P87C552
!********************************************************************************************************
!********************************************************************************************************
! MASTER STATE SERVICE ROUTINES
!********************************************************************************************************
! State 08 and State 10 are both for MST/TRX and MST/REC.
! The R/W bit decides whether the next state is within
! MST/TRX mode or within MST/REC mode.
!********************************************************************************************************
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE
: 08, A, START condition has been transmitted.
! ACTION : SLA+R/W are transmitted, ACK bit is received.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
mts8
.base
0x108
0108
010B
8551DA
75D8C5
mov S1DAT,SLA
mov S1CON,#ENS1_NOTSTA_NOTSTO_NOTSI_AA_CR0
! Load SLA+R/W
! clr SI
010E
01A0
ajmp INITBASE1
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE
!
: 10, A repeated START condition has been
transmitted.
! ACTION : SLA+R/W are transmitted, ACK bit is received.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
.base
mts10
0x110
0110
0113
8551DA
75D8C5
mov S1DAT,SLA
mov S1CON,#ENS1_NOTSTA_NOTSTO_NOTSI_AA_CR0
! Load SLA+R/W
! clr SI
010E
01A0
ajmp INITBASE1
.sect
.base
ibase1
0xa0
00A0
00A3
00A5
00A7
00AA
00AC
75D018
7930
7838
855253
D0D0
32
INITBASE1:
mov psw,#SELRB3
mov r1,#MTD
mov r0,#MRD
mov BACKUP,NUMBYTMST
pop psw
reti
! Save initial value
!********************************************************************************************************
!********************************************************************************************************
! MASTER TRANSMITTER STATE SERVICE ROUTINES
!********************************************************************************************************
!********************************************************************************************************
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE
!
: 18, Previous state was STATE 8 or STATE 10, SLA+W have been transmitted,
ACK has been received.
! ACTION : First DATA is transmitted, ACK bit is received.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
.base
mts18
0x118
0118
011B
011D
75D018
87DA
01B5
mov psw,#SELRB3
mov S1DAT,@r1
ajmp CON
54
1999 Mar 30
NXP [ NXP ]
