P89CV51RC2FA NXP Semiconductors, P89CV51RC2FA Datasheet - Page 63

• Manufacturer Part Number: P89CV51RC2FA
• Description: MCU 8-Bit 89C 80C51 CISC 32KB Flash 5V 44-Pin PLCC Tube
• Manufacturer: NXP Semiconductors

Specifications of P89CV51RC2FA

• Package: 44PLCC
• Device Core: 80C51
• Family Name: 89C
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 32
• Interface Type: SPI/UART
• Number Of Timers: 3
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Program Memory Type: Flash
• Operating Temperature: -40 to 85 °C

NXP Semiconductors
P89CV51RB2_RC2_RD2_3
Product data sheet
Fig 29. External program memory read cycle
PSEN
port 0
port 2
ALE
9.1 Explanation of symbols
Each timing symbol used in
always a ‘t’ (stands for time). The other characters, depending on their positions, stand for
the name of a signal or the logical status of that signal. The following is a list of all the
characters and what they stand for.
A — Address
C — Clock
D — Input data
H — Logic level HIGH
I — Instruction (program memory contents)
L — Logic level LOW or ALE
P — PSEN
Q — Output data
R — RD signal
T — cycle Time
V — Valid
W — WR signal
X — No longer a valid logic level
Z — High impedance (float)
Example:
t
t
AVLL
LLPL
t
= Address valid to ALE LOW time
= ALE LOW to PSEN LOW time
AVLL
t
LHLL
t
LLAX
A0 to A7
t
LLPL
Rev. 03 — 25 August 2009
t AVIV
Figure 29
A8 to A15
t
PLAZ
t
t
to
PLIV
LLIV
INSTR IN
t
P89CV51RB2/RC2/RD2
PXIX
Figure 33
t
PXIZ
t
PLPH
has 5 characters. The first character is
t
PXAV
A0 to A7
A8 to A15
80C51 with 1 kB RAM, SPI
002aaa548
© NXP B.V. 2009. All rights reserved.
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