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BIT1612 10-Bit Digital Video Decoder with OSD and T-CON

6.35 GPI and KEY Function

BIT1612 內建 8 組GPI (General Purpose Input)，並可針對各個GPI Pin分別規劃為Level Status，Key Down 或

Key Up三種觸發狀態，並可經由Interrupt (0x002[7])、R_KEY_STATUS (0x155) 及R_KEY_ACK (0x156) 讀回

其狀態。相關Registers設定請參考

Table 6-67 及 Figure 6-49。

Table 6-67 GPI and KEY Register

Mnemonic Address R/W Bits Description Default

R_KEY_STATUS 0x155[7:0] R 8 Real Time GPI Status 0x00

R_KEY_ACK 0x156[7:0] R 8 KEY Trigger Status 0x00

R_KEY_LONG_FLAG 0x157[7] R 1 Long Key Trigger Flag 0

R_KEY_LONG_ACK 0x157[3:0] R 4 Long Key Trigger Status 0x0

R_KEY_TYPE 0x150[7:0] RW 8 0: Positive Edge; 1: Negative Edge 0x00

R_KEY_DEDGE 0x151[7:0] RW 8 0: Single Edge; 1: Double Edge 0x00

R_KEY_SRC_64=0

0: TOUT_I

1: BIN

R_KEY_SRC_64=1

0: RIN

R_KEY_SRC 0x152[7] RW 1

1: HSYNC (Key[1]), VSYNC (Key[0])

R_KEY_DB 0x152[6:4] RW 3 GPI De-Bounce Setup 100

R_KEY_LONG_EN 0x152[3:0] RW 4 GPI[3:0] Long Key Monitor Enable 0x0

R_KEY_LONG_STR 0x153[7:0] RW 8 Long Key Trigger Threshold 0xFF

R_KEY_LONG_REP 0x154[7:0] RW 8 Long Key Trigger Interval 0x50

R_KEY_CLEAR 0x157[4] RW 1 0: Normal; 1: Clear 1

R_KEY_TB 0x157[6:5] RW 2 Long Key Basic Clock Cycle 01

KEY Source Selection

0: Type 1

R_KEY_SRC_64 0x14B[1] RW 1

1: Type 2

debounce time long key threshold long key repeat interval

long key repeat interval

KEY_INT

GPI

Figure 6-49 Long Key Process

6.36 PLL and OSC Pads

BIT1612 內建一組PLL，並依據Oscillator所提供的頻率產生可程式化的Clock輸出。其相關公式及Registers

請參考

Table 6-68 及 Figure 6-50。

Table 6-68 PLL Register

Mnemonic Address R/W Bits Description Default

PLL Power Down Enable

0: Normal

R_PLL_PD 0x158[0] RW 1

1: Disable

PLL Reset

0: Reset

R_PLL_RESETN 0x158[1] RW 1

1: Normal

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 114 115

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Zoom V3 1612 Manual de usuario Pagina 82

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