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PE9702 Datasheet(PDF) 9 Page - Peregrine Semiconductor Corp. |
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PE9702 Datasheet(HTML) 9 Page - Peregrine Semiconductor Corp. |
9 / 13 page Product Specification PE9702 Page 9 of 13 Document No. 70-0036-02 │ www.psemi.com ©2003-2006 Peregrine Semiconductor Corp. All rights reserved. Serial Interface Mode Serial Interface Mode is selected by setting the Bmode input “low” and the Smode input “high”. While the E_WR input is “low” and the S_WR input is “low”, serial input data (Sdata input), B0 to B19, is clocked serially into the primary register on the rising edge of Sclk, MSB (B0) first. The contents from the primary register are transferred into the secondary register on the rising edge of either S_WR or Hop_WR according to the timing diagram shown in Figure 6. Data is transferred to the counters as shown in Table 7. The double buffering provided by the primary and secondary registers allows for “ping-pong” counter control using the FSELS input. When FSELS is “high”, the primary register contents set the counter inputs. When FSELS is “low”, the secondary register contents are utilized. While the E_WR input is “high” and the S_WR input is “low”, serial input data (Sdata input), B0 to B7, is clocked serially into the enhancement register on the rising edge of Sclk, MSB (B0) first. The enhancement register is double buffered to prevent inadvertent control changes during serial loading, with buffer capture of the serially-entered data performed on the falling edge of E_WR according to the timing diagram shown in Figure 5. After the falling edge of E_WR, the data provides control bits as shown in Table 8 with bit functionality enabled by asserting the Enh input “low”. Direct Interface Mode Direct Interface Mode is selected by setting the Bmode input “high”. Counter control bits are set directly at the pins as shown in Table 7. In Direct Interface Mode, main counter inputs M7 and M8, and R Counter inputs R4 and R5 are internally forced low (“0”). MSB (first in) (last in) LSB Table 7. Primary Register Programming Table 8. Enhancement Register Programming *Serial data clocked serially on Sclk rising edge while E_WR “low” and captured in secondary register on S_WR rising edge. *Serial data clocked serially on Sclk rising edge while E_WR “high” and captured in the double buffer on E_WR falling edge. MSB (first in) (last in) LSB Interface Mode Enh Bmode Smode R5 R4 M8 M7 Pre_en M6 M5 M4 M3 M2 M1 M0 R3 R2 R1 R0 A3 A2 A1 A0 Parallel 1 0 0 M2_WR rising edge load M1_WR rising edge load A_WR rising edge load D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 Serial* 1 0 1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 Direct 1 1 X 0 0 0 0 Pre_en M6 M5 M4 M3 M2 M1 M0 R3 R2 R1 R0 A3 A2 A1 A0 Interface Mode Enh Bmode Smode Reserved Reserved Reserved Power down Counter load MSEL output Prescaler output fc, fp OE Parallel 0 0 0 E_WR rising edge load D7 D6 D5 D4 D3 D2 D1 D0 Serial* 0 0 1 B0 B1 B2 B3 B4 B5 B6 B7 |
Similar Part No. - PE9702_06 |
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