T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 31

• Manufacturer Part Number: T89C51CC01
• Description: Enhanced 8-Bit Microcontroller
• Manufacturer: Atmel

Registers
4129K–CAN–01/05
Table 18. PSW Register
PSW (S:D0h)
Program Status Word Register
Reset Value = 0000 0000b
Table 19. AUXR Register
AUXR (S:8Eh)
Auxiliary Register
Number
Number
CY
Bit
Bit
4-3
7-6
3-2
7
7
-
7
6
5
2
1
0
5
4
Mnemonic Description
Mnemonic Description
XRS1-0
RS1:0
AC
Bit
Bit
OV
CY
AC
M0
F0
F1
6
6
P
-
-
-
Carry Flag
Carry out from bit 1 of ALU operands.
Auxiliary Carry Flag
Carry out from bit 1 of addition operands.
User Definable Flag 0.
Register Bank Select Bits
Refer to Table 16 for bits description.
Overflow Flag
Overflow set by arithmetic operations.
User Definable Flag 1
Parity Bit
Set when ACC contains an odd number of 1’s.
Cleared when ACC contains an even number of 1’s.
Reserved
The value read from these bits are indeterminate. Do not set this bit.
Stretch MOVX control:
the RD/ and the WR/ pulse length is increased according to the value of M0.
M0 Pulse length in clock period
0
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
XRAM size:
Accessible size of the XRAM
XRS 1:0 XRAM size
0
0
1
1
M0
F0
5
5
6
30
0
1
0
1
512 Bytes
256 Bytes
768 Bytes
1024 Bytes (default)
RS1
4
4
-
XRS1
RS0
3
3
XRS0
OV
2
2
T89C51CC01
EXTRAM
F1
1
1
A0
0
P
0
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