EVAL-ADUC831QSZ Datasheet, PDF (16/76 Pages) Analog Devices – MicroConverter®, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU

ADuC831
Data Pointer (DPTR)
The Data Pointer is made up of three 8-bit registers, named
DPP (page byte), DPH (high byte) and DPL (low byte). These
are used to provide memory addresses for internal and external
code access and external data access. It may be manipulated as
a 16-bit register (DPTR = DPH, DPL), although INC DPTR
instructions will automatically carry over to DPP, or as three
independent 8-bit registers (DPP, DPH, DPL).
The ADuC831 supports dual data pointers. Refer to the Dual
Data Pointer section.
Program Status Word (PSW)
The PSW SFR contains several bits reflecting the current status
of the CPU as detailed in Table I.
SFR Address
Power-On Default Value
Bit Addressable
D0H
00H
Yes
Table I. PSW SFR Bit Designations
Bit
Name
Description
7
CY
Carry Flag
6
AC
Auxiliary Carry Flag
5
F0
General-Purpose Flag
4
RS1
Register Bank Select Bits
3
RS0
RS1 RS0 Selected Bank
0
0
0
0
1
1
1
0
2
1
1
3
2
OV
Overflow Flag
1
F1
General-Purpose Flag
0
P
Parity Bit
Power Control SFR (PCON)
The PCON SFR contains bits for power-saving options and
general-purpose status flags as shown in Table II.
SFR Address
87H
Power-On Default Value
00H
Bit Addressable
No
Table II. PCON SFR Bit Designations
Bit
Name
Description
7
SMOD
Double UART Baud Rate
6
SERIPD
I²C/SPI Power-Down Interrupt Enable
5
INT0PD INT0 Power-Down Interrupt Enable
4
ALEOFF Disable ALE Output
3
GF1
General-Purpose Flag Bit
2
GF0
General-Purpose Flag Bit
1
PD
Power-Down Mode Enable
0
IDL
Idle Mode Enable
–16–
REV. 0