P89CV51RB2_09 datasheet(63/76 Pages) NXP

Part #	P89CV51RB2

Description	8-bit 80C51 5 V low power 64 kB flash microcontroller with 1 kB RAM, SPI, 6-clock CPU with 6/12-clock peripherals

PDF	76 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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63 / 76 page

P89CV51RB2_RC2_RD2_3

Product data sheet

Rev. 03 — 25 August 2009

63 of 76

NXP Semiconductors

P89CV51RB2/RC2/RD2

80C51 with 1 kB RAM, SPI

9.1 Explanation of symbols

Each timing symbol used in Figure 29 to Figure 33 has 5 characters. The ﬁrst character is

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:

tAVLL = Address valid to ALE LOW time

tLLPL = ALE LOW to PSEN LOW time

Fig 29. External program memory read cycle

002aaa548

port 2

PSEN

ALE

A0 to A7

tLLAX

tPLAZ

tPXIZ

tLLPL

tAVIV

tAVLL

tLLIV

tPLIV

tPLPH

INSTR IN

A8 to A15

A0 to A7

port 0

tPXIX

tPXAV

tLHLL

P89CV51RB2 Datasheet(PDF) 63 Page - NXP Semiconductors

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