P80C32UBAA NXP Semiconductors, P80C32UBAA Datasheet - Page 19

• Manufacturer Part Number: P80C32UBAA
• Description: MCU 8-Bit 80C 80C51 CISC 32KB ROM 5V 44-Pin PLCC Tube
• Manufacturer: NXP Semiconductors

Specifications of P80C32UBAA

• Package: 44PLCC
• Device Core: 80C51
• Family Name: 80C
• Maximum Speed: 33 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 32
• Interface Type: UART
• Number Of Timers: 3
• Ram Size: 256 Byte
• Program Memory Size: 32 KB
• Program Memory Type: ROM
• Operating Temperature: 0 to 70 °C
• Controller Family/series: (8051) 8052
• No. Of I/o's: 32
• Ram Memory Size: 256Byte
• Cpu Speed: 33MHz
• No. Of Timers: 3
• Digital Ic Case Style: PLCC
• Supply: RoHS Compliant
• Core Size: 8bit
• Oscillator Type: External Only

Philips Semiconductors
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the
ALE output.
Reduced EMI Mode
AUXR (8EH)
AUXR.0
Dual DPTR
The dual DPTR structure (see Figure 13) enables a way to specify
the address of an external data memory location. There are two
16-bit DPTR registers that address the external memory, and a
single bit called DPS = AUXR1/bit0 that allows the program code to
switch between them.
AUXR1 (A2H)
Where:
The DPS bit status should be saved by software when switching
between DPTR0 and DPTR1.
2000 Aug 07
New Register Name: AUXR1#
SFR Address: A2H
Reset Value: xxx000x0B
DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1.
80C51 8-bit microcontroller family
128/256 byte RAM ROMless low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
7
–
7
–
6
–
Select Reg
6
–
DPTR0
DPTR1
AO
5
–
5
–
4
–
4
–
Turns off ALE output.
WUPD
3
–
3
2
–
2
0
DPS
0
1
1
–
1
–
AO
DPS
0
0
19
Note that bit 2 is not writable and is always read as a zero. This
allows the DPS bit to be quickly toggled simply by executing an INC
DPTR instruction without affecting the WOPD or LPEP bits.
DPTR Instructions
The instructions that refer to DPTR refer to the data pointer that is
currently selected using the AUXR1/bit 0 register. The six
instructions that use the DPTR are as follows:
The data pointer can be accessed on a byte-by-byte basis by
specifying the low or high byte in an instruction which accesses the
SFRs. See application note AN458 for more details.
INC DPTR
MOV DPTR, #data16
MOV A, @ A+DPTR
MOVX A, @ DPTR
MOVX @ DPTR , A
JMP @ A + DPTR
AUXR1
DPS
BIT0
(83H)
DPH
Increments the data pointer by 1
Loads the DPTR with a 16-bit constant
Move code byte relative to DPTR to ACC
Move external RAM (16-bit address) to
ACC
Move ACC to external RAM (16-bit
address)
Jump indirect relative to DPTR
Figure 13.
(82H)
DPL
DPTR1
DPTR0
80C31/80C32
Product specification
EXTERNAL
MEMORY
DATA
SU00745A