SPEAR320S-2 datasheet(94/113 Pages) STMICROELECTRONICS

Nome de Peças	SPEAR320S-2

Descrição Electrónicos	Embedded MPU with ARM926 core for industrial and consumer applications

PDF	113 Pages

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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Timing requirements

SPEAr320S

94/113

Doc ID 022508 Rev 2

5.12

I2S timing characteristics

Figure 27.

I2S waveform

5.13

PWM timing characteristics

This section describes the timing characteristics of the four PWM generators. Figure 28

shows two PWM waveforms in two example configurations programmed using the PWM

registers.

Figure 28.

PWM timing waveforms

Config. 1: Prescalerx = 0, Duty_reg_x = 2, Period_Reg_x = 4.

Config. 2: Prescalerx = 1, Duty_reg_x = 2, Period_Reg_x = 4.

Calculations (in PLCK periods):

PWMxDuty = (Prescalerx +1) * Duty_reg_x

PWMx Period = (Prescalerx +1) * (Period_Reg_x = 1

Table 69.

I2S timing requirements

Symbol

Description

Min

Max

Unit

tCK

I2S_CLK clock period

I2S_CLK to I2S_TX output delay

3.8

Setup time requirement for I2S_CLK

Hold time requirement for I2S_CLK

I2S_CLK

I2S_TX, I2S_LR

TCKhigh

TCKlow

2 x PCLK

3 x PCLK

6 x PCLK

4 x PCLK

PCLK

PWMx

(Config. 1)

PWMx

(Config. 2)

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