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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT95C40P bảng dữ liệu(PDF) 26 Page - Holtek Semiconductor Inc |
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HT95C40P bảng dữ liệu(HTML) 26 Page - Holtek Semiconductor Inc |
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26 / 51 page  HT95CXXX Rev. 1.50 26 May 26, 2005 DTMF Generator The DTMF (Dual Tone Multiple-Frequency) signal generator is implemented in the telephone controller. It can generate 16 dual tones and 8 single tones from the DTMF pin. This generator also supports power down, tone on/off function. The DTMF generator clock source is 3.58MHz, before using this function, the system operation mode must be at Nor- mal mode. The power down mode (D_PWDN=1) will terminate all the DTMF generator function, however, the registers DTMFC and DTMFD are accessible at this power down mode. The duration of DTMF output should be handled by the software. DTMFD register value could be changed as desired, the DTMF pin will output the new dual-tone simultaneously. Bit No. Label R/W Function 0 D_PWDN DTMF generator power down 1: DTMF generator is at power down mode. 0: DTMF generator is at operation mode. 1 ¾ RO Unused bit, read as ²0² 2 TONE RW Tone output enable 1: DTMF signal output is enabled. 0: DTMF signal output is disabled. 3 ¾ RW Reserved, inhibit using. 4 ¾ RW Reserved, inhibit using. 5 ¾ RO Unused bit, read as ²0² 6 ¾ RW Reserved, inhibit using. 7 ¾ RO Unused bit, read as ²0² DTMFC (20H) Register Note: Bit3, 4, 6 of DTMFC are reserved, always keep the initial value. Bit No. Label R/W Function 3~0 TC4~TC1 RW To set high group frequency 7~4 TR4~TR1 RW To set low group frequency DTMFD (21H) Register Note: Bit3, 4, 6 of DTMFC are reserved, always keep the initial value. The DTMF pin output is controlled by the combination of the D_PWDN, TONE, TR~TC value. Control Register Bits DTMF Pin Output Status D_PWDN TONE TR4~TR1/TC4~TC1 1x x 0 0 0 x 1/2 VDD 0 1 0 1/2 VDD 0 1 Any valid value 16 dual tones or 8 signal tones, bias with 1/2 VDD 1 / 2 V D D T O N E = 1 A l l t h e t i m i n g o f t h e T O N E = 1 a n d T O N E = 0 a r e d e t e r m i n e d b y s o f t w a r e T O N E = 0 T O N E = 1 T O N E = 0 T O N E = 1 T O N E = 0 D _ P D W N = 0 D _ P D W N = 1 DTMF Output |
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