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): 130/172頁
文件大?。?/td> 2243K
代理商: VCT3801A
VCT 38xxA
ADVANCE INFORMATION
130
Micronas
5.18.5.Audio Ports P42 to P46
The analog audio ports AIN1
3, AOUT1
2 can alter-
natively be used as digital input ports. To activate the
audio function of the port pin, the corresponding MOD
flag has to be set to Special mode. In Normal mode the
port pin serves as digital input. After reset the audio
ports are in Normal mode.
5.18.5.1. Features
– analog audio input or output
– digital input port
– Schmitt trigger input buffer
– special input function
Fig. 5–7:
Audio port circuit
AINxD
r:
AINx Data Input
Read pin level resp. data latch.
AOUTxD
r:
AOUTx Data Input
Read pin level resp. data latch.
To use the Audio ports as software input, the corre-
sponding flags must be programmed to Normal Input
mode.
AINxM
w1:
w0:
AINx Normal/Special Mode Flag
Special Audio Input Mode
Normal Input Mode
AOUTxM
w1:
w0:
AOUTx Normal/Special Mode Flag
Special Audio Output Mode
Normal Input Mode
D
Q
0
1
P4.y
DBy
Special In 4.y
P4M
P4D read
y: Port pin number 2 to 6
Audio
V
DD
V
SS