IA8044/IA8344
Data Sheet
SDLC Communications Controller
March 30, 2010
4.4
Special Function Registers
Table 9 presents the SFRs of the IA8044 and IA8344.
Table 9. Special Function Registers
Bit Addresses (Hex)
Symbol
ACC
Register Description
Accumulator
Byte Address (Hex)
E0h
(MSB–LSB)
E7h–E0h
B
B register
F0h
F7h–F0h
PSW
SP
Program Status Word
Stack Pointer
D0h
81h
D7h–D0h
–
DPH
DPL
P0
Data Pointer High Byte
Data Pointer Low Byte
Port 0
82h
83h
80h
–
–
87h–80h
P1
Port 1
90h
97h–90h
P2
Port 2
A0h
A7h–A0h
P3
Port 3
B0h
B7h–B0h
IP
Interrupt Priority
B8h
BCh–B8h
IE
Interrupt Enable
A8h
AFh,ACh–A8h
TMOD
TCON
TH0
TL0
TH1
TL1
SMD
STS
NSNR
STAD
TBS
TBL
TCB
RBS
RBL
RFL
RCB
Timer/Counter Mode
Timer/Counter Control
Timer/Counter 0 high byte
Timer/Counter 0 low byte
Timer/Counter 1 high byte
Timer/Counter 1 low byte
Serial Mode
SIU Status and Command
SIU Send/Receive Count
SIU Station Address
Transmit Buffer Start Address
Transmit Buffer Length
Transmit Control Byte
Receive Buffer Start Address
Receive Buffer Length
Receive Field Length
Receive Control Byte
89h
88h
8Ch
8Ah
8Dh
8Bh
C9h
C8h
–
8Fh–88h
–
–
–
–
–
CFh–C8h
DFh–D8h
D8h
CEh
DCh
DBh
DAh
CCh
CBh
CDh
CAh
CFh
–
–
–
–
–
–
–
–
–
–
–
DMA CNT DMA Count
FIFO
SIUST
FIFO contents (3 bytes)
SIU State Counter
DF,DE,DDh
D9h
®
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