P87C52UBAA NXP Semiconductors, P87C52UBAA Datasheet - Page 31

• Manufacturer Part Number: P87C52UBAA
• Description: MCU 8-Bit 87C52 80C51 CISC 8KB EPROM 5V 44-Pin PLCC Tube
• Manufacturer: NXP Semiconductors

Specifications of P87C52UBAA

• Package: 44PLCC
• Device Core: 80C51
• Family Name: 87C52
• Maximum Speed: 33 MHz
• Ram Size: 256 Byte
• Program Memory Size: 8 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 32
• Interface Type: UART
• Operating Temperature: 0 to 70 °C
• Number Of Timers: 3

1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
Philips Semiconductors
Table 9. Program Security Bits for EPROM Devices
NOTES:
2000 Aug 07
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
1
2
3
4
PROGRAM LOCK BITS
ALE/PROG:
ALE/PROG:
SB1
U
P
P
P
SEE EXPLODED VIEW BELOW
SB2
1
0
U
U
P
P
4–6MHz
1, 2
1
0
1
SB3
U
U
U
P
A0–A7
1
1
1
2
PROTECTION DESCRIPTION
No Program Security features enabled. (Code verify will still be encrypted by the Encryption Array if
programmed.)
MOVC instructions executed from external program memory are disabled from fetching code bytes
from internal memory, EA is sampled and latched on Reset, and further programming of the EPROM
is disabled.
Same as 2, also verify is disabled.
Same as 3, external execution is disabled. Internal data RAM is not accessible.
5 PULSES
t
GLGH
3
Figure 26. Programming Configuration
= 100 s 10 s
4
Figure 27. PROG Waveform
P1
RST
P3.6
P3.7
XTAL2
XTAL1
V
SS
5
EPROM/OTP
31
1
ALE/PROG
P2.0–P2.5
EA/V
PSEN
V
P2.7
P2.6
CC
PP
P0
t
GHGL
= 10 s MIN
80C51/87C51/80C52/87C52
+5V
SU00875
PGM DATA
+12.75V
5 PULSES TO GROUND
0
1
0
A8–A12
SU00873
Product specification