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ST7MC1K2-Auto 数据表(PDF) 89 Page - STMicroelectronics |
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ST7MC1K2-Auto 数据表(HTML) 89 Page - STMicroelectronics |
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89 / 371 page  Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 89/371 Figure 32. Exact timeout duration (tmin and tmax) WHERE: tmin0 = (LSB + 128) x 64 x tOSC2 tmax0 = 16384 x tOSC2 tOSC2 = 125ns if fOSC2 =8 MHz CNT = value of T[5:0] bits in the WDGCR register (6 bits) MSB and LSB are values from the table below depending on the timebase selected by the TB[1:0] bits in the MCCSR registe r To calculate the minimum watchdog timeout (tmin): IF THEN ELSE To calculate the maximum watchdog timeout (tmax): IF THEN ELSE NOTE: In the above formulae, division results must be rounded down to the next integer value. EXAMPLE: With 2ms timeout selected in MCCSR register TB1 bit (MCCSR reg.) TB0 bit (MCCSR reg.) Selected MCCSR timebase MSB LSB 0 0 2ms 4 59 0 1 4ms 8 53 1 0 10ms 20 35 1 1 25ms 49 54 Value of T[5:0] bits in WDGCR register (Hex.) Min. watchdog timeout (ms) tmin Max. watchdog timeout (ms) tmax 00 1.496 2.048 3F 128 128.552 CNT MSB 4 ------------- < t min t min0 16384 CNT t osc2 × × + = t min t min0 16384 CNT 4CNT MSB ----------------- – ⎝⎠ ⎛⎞ × 192 LSB + () 64 4CNT MSB ----------------- × × + t osc2 × + = CNT MSB 4 ------------- ≤ t max t max0 16384 CNT t osc2 × × + = t max t max0 16384 CNT 4CNT MSB ----------------- – ⎝⎠ ⎛⎞ × 192 LSB + () 64 4CNT MSB ----------------- × × + t osc2 × + = Obsolete Product(s) - Obsolete Product(s) |
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