參數(shù)資料
型號(hào)： SAA5288
廠商： NXP Semiconductors N.V.
英文描述： TV Microcontroller with Full Screen On Screen Display (OSD)(帶全屏屏幕顯示的TV微控制器)
中文描述： 電視微控制器，帶有全屏幕顯示（OSD）（帶全屏屏幕顯示的電視微控制器屏）
文件頁(yè)數(shù)： 10/48頁(yè)
文件大?。?/td> 508K
代理商： SAA5288
1997 Jun 24
10
Philips Semiconductors
Preliminary specification
TV microcontroller with full screen
On Screen Display (OSD)
SAA5288
7.3.6
14-
BIT
PWM DAC
One 14-bit DAC is available to allow direct control of analogue sections of the television. The 14-bit PWM is controlled
using Special Function Registers TDACL and TDACH.
The output of the TPWM is a pulse of period 42.66
μ
s. The 7 most significant bits, TDACH.TD13 (MSB) to TDACH.TD8
and TDACL.TD7, alter the pulse width between 0 and 42.33
μ
s, in much the same way as in the 6-bit PWMs. The 7 least
significant bits, TDACL.TD6 to TDACL.TD0 (LSB), extend certain pulses by a further 0.33
μ
s, e.g. if the 7 least significant
bits are given the value 01H, then 1 in 128 cycles is extended. If the 7 least significant bits are given the value 02H, then
2 in 128 cycles is extended, and so forth.
The TPWM will not start to output a new value until after writing a value to TDACH. Therefore, if the value is to be
changed, TDACL should be written to before TDACH.
7.3.6.1
TPWM High Byte Register (TDACH)
Table 5
TPWM High Byte Register (SFR address D3H)
Table 6
Description of TDACH bits
7.3.6.2
TPWM Low Byte Register (TDACL)
Table 7
TPWM Low Byte Register (SFR address D2H)
Table 8
Description of TDACL bits
7
6
5
4
3
2
1
0
PWE
TD13
TD12
TD11
TD10
TD9
TD8
BIT
SYMBOL
DESCRIPTION
7
PWE
If PWE is set to a logic 1, the TPWM is active and controls port line P2.0. If PWE is set
to a logic 0, the port pin is controlled by the corresponding bit in the port SFR.
not used
These 6-bits along with bit TD7 in the TDACL register control the pulse width period.
TD13 is the most significant bit.
6
5
4
3
2
1
0
TD13
TD12
TD11
TD10
TD9
TD8
7
6
5
4
3
2
1
0
TD7
TD6
TD5
TD4
TD3
TD2
TD1
TD0
BIT
SYMBOL
DESCRIPTION
7
TD7
This bit is used with bits TD13 to TD8 in the TDACH register to control the pulse width
period.
These 7-bits extend certain pulses by a further 0.33
μ
s.
6 to 0
TD6 to TD0
相關(guān)PDF資料
PDF描述
SAA5288PS TV microcontroller with full screen On Screen Display OSD
SAA5290 One page Economy Teletext/TV microcontroller
SAA5290A Economy teletext and TV microcontrollers
SAA5290PS Economy teletext and TV microcontrollers
SAA5290ZP One page Economy Teletext/TV microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA5288PS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontroller with full screen On Screen Display OSD
SAA5290 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers
SAA5290A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers
SAA5290PS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers
SAA5290ZP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:One page Economy Teletext/TV microcontroller
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