參數(shù)資料
型號: VCT3801A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
英文描述: Video/Controller/Teletext IC Family
中文描述: 視頻/控制/圖文電視IC系列
文件頁數(shù): 91/172頁
文件大?。?/td> 2243K
代理商: VCT3801A
ADVANCE INFORMATION
VCT 38xxA
Micronas
91
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 f
CPU
periods (for alternative set-
tings refer to register CR) and then resets the reset
request flag, thus releasing the RESQ pin.
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