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80C32E View Datasheet(PDF) - Philips Electronics

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80C32E
Philips
Philips Electronics Philips
80C32E Datasheet PDF : 62 Pages
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Philips Semiconductors
CMOS single-chip 8-bit microcontrollers
Product specification
80C52/80C54/80C58
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the
ALE output.
80C52/80C54/80C58 Reduced EMI Mode
AUXR (8EH)
7
6
5
4
3
2
1
0
AO
AO: Turns off ALE output.
Dual Data Pointer Register (DPTR)
The dual DPTR structure (see Figure 12) is a way by which the
80C52/54/58 will 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.
Register Name: AUXR1#
SFR Address: A2H
Reset Value: xxxxxxx0B
7
6
5
4
3
2
1
0
DPS
Where:
DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1.
Select Reg
DPTR0
DPTR1
DPS
0
1
The DPS bit status whould be saved by software when switching
between DPTR0 and DPTR1.
DPS
BIT0
AUXR1
DPH
(83H)
DPL
(82H)
DPTR1
DPTR0
EXTERNAL
DATA
MEMORY
SU00745A
Figure 12. DPTR Structure
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:
INC DPTR
MOV DPTR, #data16
MOV A, @ A+DPTR
MOVX A, @ DPTR
MOVX @ DPTR , A
JMP @ A + DPTR
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
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 detailed operation
ABSOLUTE MAXIMUM RATINGS1, 2, 3
PARAMETER
RATING
UNIT
Operating temperature under bias
0 to +70 or –40 to +85
°C
Storage temperature range
–65 to +150
°C
Voltage on EA/VPP pin to VSS
0 to +13.0
V
Voltage on any other pin to VSS
–0.5 to +6.5
V
Maximum IOL per I/O pin
15
mA
Power dissipation (based on package heat transfer limitations, not device power consumption)
1.5
W
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section
of this specification is not implied.
2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise
noted.
1996 Aug 16
18
 

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