P89V51RD2FN NXP Semiconductors, P89V51RD2FN Datasheet - Page 9

• Manufacturer Part Number: P89V51RD2FN
• Description: MCU 8-Bit 89V 80C51 CISC 64KB Flash 5V 40-Pin PDIP Tube
• Manufacturer: NXP Semiconductors

Specifications of P89V51RD2FN

• Package: 40PDIP
• Device Core: 80C51
• Family Name: 89V
• Maximum Speed: 40 MHz
• Ram Size: 1 KB
• Program Memory Size: 64 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 32
• Interface Type: SPI/UART
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

NXP Semiconductors
Table 3.
[1]
[2]
P89V51RB2_RC2_RD2_5
Product data sheet
Symbol
RST
EA
ALE/PROG
n.c.
XTAL1
XTAL2
V
V
DD
SS
ALE loading issue: When ALE pin experiences higher loading (>30 pF) during the reset, the microcontroller may accidentally enter into
modes other than normal working mode. The solution is to add a pull-up resistor of 3 k to 50 k to V
For 6-clock mode, ALE is emitted at
P89V51RB2/RC2/RD2 pin description
Pin
DIP40
9
31
30
-
19
18
40
20
TQFP44
4
29
27
6, 17, 28,
39
15
14
38
16
1
3
of crystal frequency.
PLCC44
10
35
33
1, 12, 23,
34
21
20
44
22
Rev. 05 — 12 November 2009
…continued
Type
I
I
I/O
I/O
I
O
I
I
Description
Reset: While the oscillator is running, a HIGH logic state
on this pin for two machine cycles will reset the device. If
the PSEN pin is driven by a HIGH-to-LOW input transition
while the RST input pin is held HIGH, the device will enter
the external host mode, otherwise the device will enter the
normal operation mode.
External Access Enable: EA must be connected to V
order to enable the device to fetch code from the external
program memory. EA must be strapped to V
program execution. The EA pin can tolerate a high voltage
of 12 V.
Address Latch Enable: ALE is the output signal for
latching the low byte of the address during an access to
external memory. This pin is also the programming pulse
input (PROG) for flash programming. Normally the ALE
is emitted at a constant rate of
and can be used for external timing and clocking. One ALE
pulse is skipped during each access to external data
memory. However, if AO is set to ‘1’, ALE is disabled.
not connected
Crystal 1: Input to the inverting oscillator amplifier and
input to the internal clock generator circuits.
Crystal 2: Output from the inverting oscillator amplifier.
Power supply
Ground
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
DD
1
, e.g., for ALE pin.
6
the crystal frequency
© NXP B.V. 2009. All rights reserved.
DD
for internal
9 of 80
SS
[2]
[1]
in