P87C52 PHILIPS [NXP Semiconductors], P87C52 Datasheet - Page 11

• Manufacturer Part Number: P87C52
• Description: 80C51 8-bit microcontrollers 16K/32K, 512 OTP, I2C, watchdog timer
• Manufacturer: PHILIPS [NXP Semiconductors]

1. Absent in the TSSOP38 package.
Philips Semiconductors
NOTES:
To avoid “latch-up” effect at power-on, the voltage on any pin at any time must not be higher than V
2003 Jan 24
PSEN
EA/V
XTAL1
XTAL2
MNEMONIC
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
PP
DIP
29
31
19
18
PLCC
PIN NUMBER
32
35
21
20
LQFP
26
29
15
14
TSSOP
18
20
8
7
TYPE
O
O
I
I
NAME AND FUNCTION
Program Store Enable: The read strobe to external program memory. When the
device is executing code from the external program memory, PSEN is activated
twice each machine cycle, except that two PSEN activations are skipped during
each access to external data memory. PSEN is not activated during fetches from
internal program memory.
External Access Enable/Programming Supply Voltage: EA must be externally held low to enable
the device to fetch code from external program memory locations 0000H to
0FFFH/1FFFH/3FFFH/7FFFH. If EA is held high, the device executes from internal program memory
unless the program counter contains an address greater than the on-chip ROM/OTP. This pin also
receives the 12.75 V programming supply voltage (V
1 is programmed, EA will be internally latched on Reset.
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock
generator circuits.
Crystal 2: Output from the inverting oscillator amplifier.
11
CC
P80C3xX2; P80C5xX2;
+ 0.5 V or V
PP
) during EPROM programming. If security bit
SS
– 0.5 V, respectively.
P87C5xX2
Product data