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PIC12LC671 数据表(PDF) 100 Page - Microchip Technology |
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PIC12LC671 数据表(HTML) 100 Page - Microchip Technology |
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100 / 129 page  PIC12C67X DS30561B-page 100 © 1999 Microchip Technology Inc. 12.6 Timing Diagrams and Specifications FIGURE 12-5: EXTERNAL CLOCK TIMING TABLE 12-1: CLOCK TIMING REQUIREMENTS Parameter No. Sym Characteristic Min Typ† Max Units Conditions FOSC External CLKIN Frequency (Note 1) DC — 4 MHz XT and EXTRC osc mode DC — 4 MHz HS osc mode (PIC12CE67X-04) DC — 10 MHz HS osc mode (PIC12CE67X-10) DC — 200 kHz LP osc mode Oscillator Frequency (Note 1) DC — 4 MHz EXTRC osc mode .455 — 4 MHz XT osc mode 4 — 4 MHz HS osc mode (PIC12CE67X-04) 4 — 10 MHz HS osc mode (PIC12CE67X-10) 5 — 200 kHz LP osc mode 1TOSC External CLKIN Period (Note 1) 250 — — ns XT and EXTRC osc mode 250 — — ns HS osc mode (PIC12CE67X-04) 100 — — ns HS osc mode (PIC12CE67X-10) 5— — µs LP osc mode Oscillator Period (Note 1) 250 — — ns EXTRC osc mode 250 — 10,000 ns XT osc mode 250 — 250 ns HS osc mode (PIC12CE67X-04) 100 — 250 ns HS osc mode (PIC12CE67X-10) 5— — µsLP osc mode 2TCY Instruction Cycle Time (Note 1) 400 — DC ns TCY = 4/FOSC 3 TosL, TosH External Clock in (OSC1) High or Low Time 50 — — ns XT oscillator 2.5 — — µs LP oscillator 10 — — ns HS oscillator 4TosR, TosF External Clock in (OSC1) Rise or Fall Time — — 25 ns XT oscillator — — 50 ns LP oscillator — — 15 ns HS oscillator † Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested. Note 1: Instruction cycle period (TCY) equals four times the input oscillator time-base period. All specified values are based on characterization data for that particular oscillator type under standard operating conditions with the device exe- cuting code. Exceeding these specified limits may result in an unstable oscillator operation and/or higher than expected current consumption. All devices are tested to operate at "min." values with an external clock applied to the OSC1/CLKIN pin. When an external clock input is used, the "Max." cycle time limit is "DC" (no clock) for all devices. OSC2 is discon- nected (has no loading) for the PIC12C67X. OSC1 CLKOUT Q4 Q1 Q2 Q3 Q4 Q1 1 2 3 3 4 4 |
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