Datasheet

FDS_6533_6534_004 71M6533/G/H and 71M6534/H Data Sheet
Rev 2 23
Name
Address
(Hex)
Reset value
(Hex)
Description Page
IEN0
0xA8
0x00
Interrupt Enable Register 0
31
IP0
0xA9
0x00
Interrupt Priority Register 0
34
S0RELL
0xAA
0xD9
Serial Port 0, Reload Register, low byte
26
P3
0xB0
0xFF
Port 3
24
IEN1
0xB8
0x00
Interrupt Enable Register 1
31
IP1
0xB9
0x00
Interrupt Priority Register 1
34
S0RELH
0xBA
0x03
Serial Port 0, Reload Register, high byte
26
S1RELH
0xBB
0x03
Serial Port 1, Reload Register, high byte
26
PDATA
0xBF
0x00
High address byte for MOVX@Ri - also called USR2
20
IRCON
0xC0
0x00
Interrupt Request Control Register
32
T2CON
0xC8
0x00
Polarity for INT2 and INT3
32
PSW
0xD0
0x00
Program Status Word
23
WDCON
0xD8
0x00
Baud Rate Control Register (only WDCON[7] bit used)
26
A
0xE0
0x00
Accumulator
23
B
0xF0
0x00
B Register
23
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 Symbol Function
7
CV
Carry flag.
6
AC
Auxiliary Carry flag for BCD operations.
5
F0
General purpose Flag 0 available for user.
F0 is not to be confused with the F0 flag in the CESTATUS register.
4
RS1
Register bank select control bits. The contents of RS1 and RS0 select the
working register bank:
RS1/RS0
Bank selected
Location
00
Bank 0
0x00 – 0x07
01
Bank 1
0x08 – 0x0F
10
Bank 2
0x10 – 0x17
11
Bank 3
0x18 – 0x1F
3
RS0
2
OV
Overflow flag.
1
–
User defined flag.
0
P
Parity flag, affected by hardware to indicate odd or even number of one bits in
the Accumulator, i.e. even parity.