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FDS_6533_6534_004
71M6533/G/H and 71M6534/H Data Sheet
Name
IEN0
IP0
S0RELL
P3
IEN1
IP1
S0RELH
S1RELH
PDATA
IRCON
T2CON
PSW
WDCON
A
B
Address
(Hex)
0xA8
0xA9
0xAA
0xB0
0xB8
0xB9
0xBA
0xBB
0xBF
0xC0
0xC8
0xD0
0xD8
0xE0
0xF0
Reset value
(Hex)
0x00
0x00
0xD9
0xFF
0x00
0x00
0x03
0x03
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Description
Interrupt Enable Register 0
Interrupt Priority Register 0
Serial Port 0, Reload Register, low byte
Port 3
Interrupt Enable Register 1
Interrupt Priority Register 1
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
Baud Rate Control Register (only WDCON[7] bit used)
Accumulator
B Register
Page
Accumulator ( ACC , A, SFR 0xE0 ):
ACC is the accumulator register. Most instructions use the accumulator to hold the operand. The
mnemonics for accumulator-specific instructions refer to accumulator as A , not ACC .
B Register ( SFR 0xF0 ):
The B register is used during multiply and divide instructions. It can also be used as a scratch-pad register
to hold temporary data.
Program Status Word ( PSW, SFR 0xD0) ):
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
7
6
5
4
Symbol
CV
AC
F0
RS1
Function
Carry flag.
Auxiliary Carry flag for BCD operations.
General purpose Flag 0 available for user.
F0 is not to be confused with the F0 flag in the CESTATUS register.
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
3
RS0
01
10
11
Bank 1
Bank 2
Bank 3
0x08 – 0x0F
0x10 – 0x17
0x18 – 0x1F
2
1
0
Rev 2
OV
–
P
Overflow flag.
User defined flag.
Parity flag, affected by hardware to indicate odd or even number of one bits in
the Accumulator, i.e. even parity.
23
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