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P89C51RD+IB Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer P89C51RD+IB
Beschreibung 80C51 8-bit Flash microcontroller family 32K/64K ISP FLASH with 512.1K RAM
Hersteller NXP Semiconductors
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Gesamt 50 Seiten
P89C51RD+IB Datasheet, Funktion
INTEGRATED CIRCUITS
P89C51RC+/P89C51RD+
80C51 8-bit Flash microcontroller family
32K/64K ISP FLASH with 512–1K RAM
Product specification
Replaces 89C51RC+/RD+ of 1999 Apr 01
(see Notes 1 and 2 on page 2)
Supersedes data of 1999 Apr 01
IC28 Data Handbook
1999 Oct 27
Philips
Semiconductors






P89C51RD+IB Datasheet, Funktion
Philips Semiconductors
80C51 8-bit Flash microcontroller family
32K/64K ISP FLASH with 512–1K RAM
Product specification
P89C51RC+/P89C51RD+
PIN DESCRIPTIONS (Continued)
PIN NUMBER
MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION
PSEN
29 32
26
O Program Store Enable: The read strobe to external program memory. When 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.
EA/VPP
31 35
29
I 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 and
7FFFH. If EA is held high, the device executes from internal program memory unless the
program counter contains an address greater than 7FFFH for 32 k devices. The value on
the EA pin is latched when RST is released and any subsequent changes have no effect.
Since the RD+ has 64 k internal memory, the RD+ will execute only from internal memory
when EA is held high. This pin also receives the 12.00 V programming supply voltage (VPP)
during FLASH programming.
XTAL1
19 21
15
I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator
circuits.
XTAL2
18 20
14
O Crystal 2: Output from the inverting oscillator amplifier.
NOTE:
To avoid “latch-up” effect at power-on, the voltage on any pin (other than VPP) at any time must not be higher than VCC + 0.5 V or VSS – 0.5 V,
respectively.
1999 Oct 27
6

6 Page









P89C51RD+IB pdf, datenblatt
Philips Semiconductors
80C51 8-bit Flash microcontroller family
32K/64K ISP FLASH with 512–1K RAM
Product specification
P89C51RC+/P89C51RD+
OSC
÷ 12
T2 PIN
C/T2 = 0
C/T2 = 1
TRANSITION
DETECTOR
CONTROL
TR2 RELOAD
TL2
(8-BITS)
TH2
(8-BITS)
RCAP2L
RCAP2H
T2EX PIN
CONTROL
EXEN2
Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0)
(DOWN COUNTING RELOAD VALUE)
FFH
FFH
TF2
EXF2
TIMER 2
INTERRUPT
SU00067
TOGGLE
EXF2
OSC ÷12 C/T2 = 0
T2 PIN
C/T2 = 1
OVERFLOW
TL2 TH2
TF2
CONTROL
TR2
RCAP2L
RCAP2H
(UP COUNTING RELOAD VALUE)
Figure 5. Timer 2 Auto Reload Mode (DCEN = 1)
COUNT
DIRECTION
1 = UP
0 = DOWN
T2EX PIN
INTERRUPT
SU00730
1999 Oct 27
12

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