P89V664FA512 datasheet(47/90 Pages) NXP

No de pièce	P89V664FA512

Description	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI

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P89V660_662_664

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Product data sheet

Rev. 3.1 — 17 October 2011

47 of 90

NXP Semiconductors

P89V660/662/664

80C51 with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI

In the Clock-Out mode Timer 2 rollovers will not generate an interrupt. This is similar to

when it is used as a baud rate generator.

6.6.4 Baud rate generator mode

Bits TCLK and/or RCLK in T2CON allow the UART) transmit and receive baud rates to be

derived from either Timer 1 or Timer 2 (See Section 6.7 for details). When TCLK = 0,

Timer 1 is used as the UART transmit baud rate generator. When TCLK = 1, Timer 2 is

used as the UART transmit baud rate generator. RCLK has the same effect for the UART

receive baud rate. With these two bits, the serial port can have different receive and

transmit baud rates – Timer 1 or Timer 2.

Figure 21 shows Timer 2 in baud rate generator mode:

The baud rate generation mode is like the auto-reload mode, when a rollover in TH2

causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and

RCAP2L, which are preset by software.

The baud rates in modes 1 and 3 are determined by Timer 2’s overflow rate given below:

Modes 1 and 3 Baud Rates = Timer 2 Overflow Rate / 16

The timer can be configured for either ‘timer’ or ‘counter’ operation. In many applications,

it is configured for ‘timer' operation (C/T2 = 0). Timer operation is different for Timer 2

when it is being used as a baud rate generator.

Usually, as a timer it would increment every machine cycle (i.e., 1⁄6 the oscillator

frequency). As a baud rate generator, it increments at the oscillator frequency. Thus the

baud rate formula is as follows:

Modes 1 and 3 Baud Rates =

(3)

Where k = 16 (6-clock mode) and k = 32 (12-clock mode);

Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit

unsigned integer.

Fig 21. Timer 2 in Baud Rate Generator mode

002aaa526

TX/RX baud rate

timer 2

interrupt

OSC

÷2

T2 pin

C/T2 = 0

C/T2 = 1

TL2

(8-bits)

TH2

(8-bits)

control

TR2

EXF2

RCAP2L RCAP2H

control

EXEN2

transition

detector

T2EX pin

reload

OscillatorFrequency

k

65536

RCAP2H RCAP2L





–





---------------------------------------------------------------------------------------

Numéro de pièce similaire - P89V664FA512

Fabricant	No de pièce	Fiches technique	Description
NXP Semiconductors	P89V664FA	392Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 01 - 2 May 2007
	P89V664FA	393Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 02-29 January 2008
	P89V664FA	393Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 03-10 November 2008

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Description similaire - P89V664FA512

Fabricant	No de pièce	Fiches technique	Description
NXP Semiconductors	P89V660	392Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 01 - 2 May 2007
	P89V660_0811	393Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 03-10 November 2008
	P89V660	393Kb / 89P	8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI Rev. 02-29 January 2008
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	P89LV51RB2	349Kb / 77P	8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM Rev. 04-02 December 2004
	P89LV51RB2	332Kb / 76P	8-bit 80C51 3 V low power 16/32/64 kB flash microcontroller with 1 kB RAM Rev. 05-15 December 2009
	P89LV51RD2	349Kb / 77P	8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM Rev. 03-11 October 2004

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