P80C51BH Intel, P80C51BH Datasheet - Page 14

• Manufacturer Part Number: P80C51BH
• Manufacturer: Intel

Specifications of P80C51BH

• Cpu Family: MCS51
• Device Core Size: 8b
• Frequency (max): 16MHz
• Program Memory Type: ROM
• Program Memory Size: 4KB
• Total Internal Ram Size: 128Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

AUTOMOTIVE 80C31BH 80C51BH 87C51
Quick-Pulse Programming
(EPROM Only)
The setup for Microcontroller Quick-Pulse Program-
ming is shown in Figure 11 Note that the 87C51 is
running with a 4 to 6 MHz oscillator The reason the
oscillator needs to be running is that the device is
executing internal address and program data trans-
fers
The address of the EPROM location to be pro-
grammed is applied to Ports 1 and 2 as shown in
Figure 11 The code byte to be programmed into
that location is applied to Port 0 RST PSEN and
pins of Ports 2 and 3 specified in Table 3 are held at
the ‘‘Program Code Data’’ levels indicated in Table
2 Then ALE PROG is pulsed low 25 times as
shown in Figure 12
To program the Encryption Table repeat the 25-
pulse programming sequence for addresses 0
14
Figure 13 Program Verification
Figure 12 PROG Waveforms
through 1FH using the ‘‘Pgm Encryption Table’’ lev-
els Don’t forget that after the Encryption Table is
programmed verify cycles will produce only encrypt-
ed data
To program the Lock Bits repeat the 25-pulse pro-
gramming sequence using the ‘‘Pgm Lock Bit’’ lev-
els After one Lock Bit is programmed further pro-
gramming of the Code Memory and Encryption Ta-
ble is disabled However the other Lock Bit can still
be programmed
Note that the EA V
above the maximum specified V
amount of time Even a narrow glitch above that volt-
age level can cause permanent damage to the de-
vice The V
free of glitches and overshoot
PP
source should be well regulated and
PP
pin must not be allowed to go
270419 –21
PP
level for any
270419 –20