VCT3834A datasheet(91/172 Pages) MICRONAS

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ADVANCE INFORMATION

VCT 38xxA

Micronas

5.7.2.1. From Standby into Normal Mode

To switch the whole TV application from standby oper-

ation into normal mode the controller has to perform

the following sequence:

– RC.RESDIS = 1, RC.DCOCLP = 1

– RC.RESOUT =1

– switch on power supply

– wait for stable power supply

– RC.SELCLK = 1, RC.I2CEN = 1

– RC.DCOCLP = 0, RC.RESOUT = 0

– wait for RC.ALI = 0 (ext. capacitor!)

– RC.RESDIS = 0

– init DMA interface

– init TPU, VDP and Audio

– init external devices

5.7.2.2. From Normal into Standby Mode

To switch the whole TV application from normal mode

into standby operation the controller has to perform the

following sequence:

– RC.DCOCLP = 1, RC.I2CEN = 0

– wait 1ms for stable 20.25MHz DCO

– RC.SELCLK = 0

– turn off power supply

– set TPU into standby mode

– SR0 = 2, SR1 = 8, SR2 = 0

5.7.3. Internal Reset Sources

The VCT 38xxA contains three internal circuits that are

able to generate a system reset: watchdog, supply

supervision, and clock supervision.

All internal resets are directed to the open drain output

of pin RESQ. Thus a “wired or” combination with exter-

nal reset sources is possible. The RESQ pin is current

limited and therefore large external capacitances may

be connected.

All internal reset sources initially set a reset request

flag. This flag activates the pull-down transistor on the

RESQ pin. An internal reset prolongation counter

starts, as soon as no internal reset source is active any

more. It counts 4096 fCPU periods (for alternative set-

tings refer to register CR) and then resets the reset

request flag, thus releasing the RESQ pin.

VCT3834A Datasheet(PDF) 91 Page - Micronas

VCT3834A Datasheet(HTML) 91 Page - Micronas

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