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參數(shù)資料
| 型號(hào)： | WM9712LEFV |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Audio and Touchpanel CODEC |
| 中文描述： | AC97音頻編解碼器和觸摸屏 |
| 文件頁(yè)數(shù)： | 53/78頁(yè) |
| 文件大?。?/td> | 689K |
| 代理商： | WM9712LEFV |
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Production Data
WM9712L
w
PD Rev 4.0 December 2003
53
The properties of the GPIOs are controlled through registers 4Ch to 52h, as shown below.
REGISTER
ADDRESS
4Ch
BIT
LABEL
DEFAULT
DESCRIPTION
n
GCn
1
GPIO Pin Configuration
0: Output
1: Input
GC11-15 are always ‘1’
Unused bits GC6-GC10 are always ‘0’
GPIO Pin Polarity / Type
0: Active Low
1: Active High
[GIn = pin level XNOR GPn]
Unused bits GP6-GP10 are always ‘1’
GPIO Pin Sticky
1: Sticky
0: Not Sticky
Unused bits GS6-GS10 are always ‘0’
GPIO Pin Wake-up
1: Wake Up (generate interrupts from this pin)
0: No wake-up (no interrupts generated)
Unused bits GW6-GW10 are always ‘0’
GPIO Pin Status
Read: Returns status of each GPIO pin
Write: Writing ‘0’ clears sticky bit
Unused bits GI6-GI10 are always ‘0’
4Eh
n
GPn
1
50h
n
GSn
0
52h
n
GWn
0
54h
n
GIn
N/A
Table 38 GPIO Control
The following procedure is recommended for handling interrupts:
When the controller receives an interrupt, check register 54h. For each GPIO bit in descending order
of priority, check if the bit is ‘1’. If yes, execute corresponding interrupt routine, then write ‘0’ to
corresponding bit in 54h. If no, continue to next lower priority GPIO. After all GPIOs have been
checked, check if the interrupt still present or no. If yes, repeat procedure. If no, then jump back to
process that ran before the interrupt.
If the system CPU cannot execute such an interrupt routine, it may be preferable to switch internal
signals (such as PENDOWN) directly onto the GPIO pins. However, in this case the interrupt signals
cannot be made sticky, and more GPIO pins are tied up both on the WM9712L and on the CPU.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFV | AC97 Audio and Touchpanel CODEC |
| WME128K8-XXX | 128Kx8 CMOS MONOLITHIC EEPROM, SMD 5962-96796 |
| WME128K8 | 128Kx8 CMOS Monolithic EEPROM(128Kx8 CMOS單片EEPROM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM9712LGEFL/RV | 功能描述:接口—CODEC STR AC’97 CODEC TP 48-pin TQFP RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| WM9712LGEFL/V | 功能描述:接口—CODEC Stereo AC’97 CODEC T/P Interface RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| WM9712LSEFL | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
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