71M6531D Datasheet, PDF (23/115 Pages) Teridian Semiconductor Corporation – Energy Meter IC

FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
Name
S1RELL
IEN0
IP0
S0RELL
IEN1
IP1
S0RELH
S1RELH
PDATA
IRCON
T2CON
PSW
WDCON
A
B
Address
(Hex)
0x9D
0xA8
0xA9
0xAA
0xB8
0xB9
0xBA
0xBB
0xBF
0xC0
0xC8
0xD0
0xD8
0xE0
0xF0
Reset value
(Hex)
0x00
0x00
0x00
0xD9
0x00
0x00
0x03
0x03
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Description
Serial Port 1, Reload Register, low byte
Interrupt Enable Register 0
Interrupt Priority Register 0
Serial Port 0, Reload Register, low byte
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
27
31
34
27
31
34
27
27
20
32
32
23
26
23
23
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
7
6
5
Symbol
CV
AC
F0
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.
4
RS1 Register bank select control bits. The contents of RS1 and RS0 select the
working register bank:
RS1/RS0
Bank selected
Location
3
RS0
00
Bank 0
0x00 – 0x07
01
Bank 1
0x08 – 0x0F
10
Bank 2
0x10 – 0x17
11
Bank 3
0x18 – 0x1F
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.
v1.2
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