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P87C52SBAA,512

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38
Philips Semiconductors Product specification
80C51/87C51/80C52/87C52
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
2000 Aug 07
19
PX0IP (0B8H)
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
BIT SYMBOL FUNCTION
IP.7 — Not implemented, reserved for future use.
IP.6 — Not implemented, reserved for future use.
IP.5 PT2 Timer 2 interrupt priority bit.
IP.4 PS Serial Port interrupt priority bit.
IP.3 PT1 Timer 1 interrupt priority bit.
IP.2 PX1 External interrupt 1 priority bit.
IP.1 PT0 Timer 0 interrupt priority bit.
IP.0 PX0 External interrupt 0 priority bit.
SU00572
PT0PX1PT1PSPT2——
01234567
Figure 11. IP Registers
PX0HIPH (B7H)
Priority Bit = 1 assigns higher priority
Priority Bit = 0 assigns lower priority
BIT SYMBOL FUNCTION
IPH.7 — Not implemented, reserved for future use.
IPH.6 — Not implemented, reserved for future use.
IPH.5 PT2H Timer 2 interrupt priority bit high.
IPH.4 PSH Serial Port interrupt priority bit high.
IPH.3 PT1H Timer 1 interrupt priority bit high.
IPH.2 PX1H External interrupt 1 priority bit high.
IPH.1 PT0H Timer 0 interrupt priority bit high.
IPH.0 PX0H External interrupt 0 priority bit high.
SU01058
PT0HPX1HPT1HPSHPT2H——
01234567
Figure 12. IPH Registers
Philips Semiconductors Product specification
80C51/87C51/80C52/87C52
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
2000 Aug 07
20
Reduced EMI
All port pins of the 8xC51 and 8xC52 have slew rate controlled
outputs. This is to limit noise generated by quickly switching output
signals. The slew rate is factory set to approximately 10 ns rise and
fall times.
Reduced EMI Mode
The AO bit (AUXR.0) in the AUXR register when set disables the
ALE output.
AUXR (8EH)
765432 1 0
– – – – – – – AO
AUXR.0 AO Turns off ALE output.
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.
• New Register Name: AUXR1#
• SFR Address: A2H
• Reset Value: xxx000x0B
AUXR1 (A2H)
76543210
– – – LPEP WUPD 0 – DPS
Where:
DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1.
Select Reg DPS
DPTR0 0
DPTR1 1
The DPS bit status should be saved by software when switching
between DPTR0 and DPTR1.
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.
DPS
DPTR1
DPTR0
DPH
(83H)
DPL
(82H)
EXTERNAL
DATA
MEMORY
SU00745A
BIT0
AUXR1
Figure 13.
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 Increments the data pointer by 1
MOV DPTR, #data16 Loads the DPTR with a 16-bit constant
MOV A, @ A+DPTR Move code byte relative to DPTR to ACC
MOVX A, @ DPTR Move external RAM (16-bit address) to
ACC
MOVX @ DPTR , A Move ACC to external RAM (16-bit
address)
JMP @ A + DPTR 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 more details.
Philips Semiconductors Product specification
80C51/87C51/80C52/87C52
80C51 8-bit microcontroller family
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V),
low power, high speed (33 MHz), 128/256 B RAM
2000 Aug 07
21
ABSOLUTE MAXIMUM RATINGS
1,
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/V
PP
pin to V
SS
0 to +13.0 V
Voltage on any other pin to V
SS
–0.5 to +6.5 V
Maximum I
OL
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 maximum.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V
SS
unless otherwise
noted.
AC ELECTRICAL CHARACTERISTICS
T
amb
= 0°C to +70°C or –40°C to +85°C
CLOCK FREQUENCY
RANGE –f
SYMBOL FIGURE PARAMETER MIN MAX UNIT
1/t
CLCL
29 Oscillator frequency
Speed versions : S (16 MHz)
U (33 MHz)
0
0
16
33
MHz
MHz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38

P87C52SBAA,512

Mfr. #:
Buy P87C52SBAA,512
Manufacturer:
NXP Semiconductors
Description:
Microcontrollers - MCU 8-bit Microcontrollers - MCU 80C51 8K/256 OTP 16MHZ
Lifecycle:
New from this manufacturer.
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