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
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE : B8, DATA has been transmitted, ACK received.
! ACTION : DATA will be transmitted, ACK bit is received.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
stsb8
.base
0x1b8
01B8
01BB
01BD
75D018
87DA
01F8
mov psw,#SELRB3
mov S1DAT,@r1
ajmp SCON
.sect
scn
.base
0xf8
00F8
75D8C5
SCON:
mov S1CON,#ENS1_NOTSTA_NOTSTO_NOTSI_AA_CR0
! clr SI, set AA
00FB
00FC
00FE
09
D0D0
32
inc
pop psw
reti
r1
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE : C0, DATA has been transmitted, NOT ACK received.
! ACTION : Enter not addressed SLV mode.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
stsc0
.base
0x1c0
01C0
75D8C5
mov S1CON,#ENS1_NOTSTA_NOTSTO_NOTSI_AA_CR0
! clr SI, set AA
01C3
01C5
D0D0
32
pop psw
reti
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
! STATE : C8, Last DATA has been transmitted (AA=0), ACK received.
! ACTION : Enter not addressed SLV mode.
!– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
.sect
stsc8
.base
0x1c8
01C8
01CB
75D8C5
D0D0
mov S1CON,#ENS1_NOTSTA_NOTSTO_NOTSI_AA_CR0
! clr SI, set AA
pop psw
reti
01CD 32
!********************************************************************************************************
!********************************************************************************************************
! END OF SI01 INTERRUPT ROUTINE
!********************************************************************************************************
!********************************************************************************************************
60
1999 Mar 30
NXP [ NXP ]
