FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
Name
Address Reset value
(Hex) (Hex)
0x9D 0x00
Description
Page
S1RELL
IEN0
Serial Port 1, Reload Register, low byte
Interrupt Enable Register 0
27
31
34
27
31
34
27
27
20
32
32
23
26
23
23
0xA8
0xA9
0xAA
0xB8
0xB9
0xBA
0xBB
0xBF
0xC0
0xC8
0xD0
0xD8
0xE0
0xF0
0x00
0x00
0xD9
0x00
0x00
0x03
0x03
0x00
0x00
0x00
0x00
0x00
0x00
0x00
IP0
Interrupt Priority Register 0
S0RELL
IEN1
Serial Port 0, Reload Register, low byte
Interrupt Enable Register 1
IP1
Interrupt Priority Register 1
S0RELH
S1RELH
PDATA
IRCON
T2CON
PSW
Serial Port 0, Reload Register, high byte
Serial Port 1, Reload Register, high byte
High address byte for MOVX@Ri - also called USR2
Interrupt Request Control Register
Polarity for INT2 and INT3
Program Status Word
WDCON
A
Baud Rate Control Register (only WDCON[7] bit used)
Accumulator
B
B Register
Accumulator (ACC, A):
ACC is the accumulator register. Most instructions use the accumulator to hold the operand. The mne-
monics for accumulator-specific instructions refer to accumulator as A, not ACC.
B Register:
The B register is used during multiply and divide instructions. It can also be used as a scratch-pad regis-
ter to hold temporary data.
Program Status Word (PSW):
This register contains various flags and control bits for the selection of the register banks (see Table 11).
Table 11: PSW Bit Functions (SFR 0xD0)
PSW Bit
Symbol
CV
Function
7
6
5
Carry flag.
AC
Auxiliary Carry flag for BCD operations.
General-purpose Flag 0 available for user.
F0
F0 is not to be confused with the F0 flag in the CESTATUS register.
4
3
RS1
RS0
Register bank select control bits. The contents of RS1 and RS0 select the
working register bank:
RS1/RS0
00
Bank selected
Bank 0
Location
0x00 – 0x07
0x08 – 0x0F
0x10 – 0x17
0x18 – 0x1F
01
Bank 1
10
Bank 2
11
Bank 3
2
1
0
OV
-
Overflow flag.
User defined flag.
P
Parity flag, affected by hardware to indicate odd or even number of one bits in
the Accumulator, i.e. even parity.
v1.2
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