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PC8374L Datasheet(PDF) 180 Page - National Semiconductor (TI) |
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PC8374L Datasheet(HTML) 180 Page - National Semiconductor (TI) |
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180 / 239 page  8.0 Health Management (HM) (Continued) www.national.com 180 Revision1.1 8.5.60 Tach Mode Location: 43h Type: R/W Table 55. Fan Monitoring Configuration 8.5.61 Tachometer Monitoring Control Location: 78h Type: R/W or RO (Becomes read-only when LOCK bit in the Configuration register is set.) Bit 76543210 Name Reserved FAN4_ MODE FAN3_ MODE FAN2_ MODE FAN1_ MODE Reset 00000000 Bit Description 7-4 Reserved. 3-0 FAN4_MODE-FAN1_MODE. Sets Fan4-Fan1 monitoring mode according to Table 55. FANn_MODE Description 0 Measurements performed independently of any FANPWM output (default). Each measurement lasts one or two tachometer cycles, according to TPPR bit in Tachometer Monitoring Control register. 1 Measurements performed when the associated1 FANPWM is at “On” level. The “On” level of the FANPWM signal can be extended to 1/2, one or two tachometer cycles, according to TPPR bit. A successful measurement requires only 1/2 a tachometer cycle. 1. See Tach PWM Association Register in Section 8.5.62 on page 181. Bit 76543210 Name Reserved TPPR4 TPPR3 TPPR2 TPPR1 Reset 00000000 Bit Description 7-4 Reserved. 3 TPPR4 (Tachometer Pulses Per Revolution 4). Selects the number of pulses per fan revolution generated by FANTACH4 (and thus the division factor for the normalization of the fan speed data in the Fan Tachometer Reading 4 registers). 0: Two pulses per revolution (default) 1: One pulse per revolution 2 TPPR3 (Tachometer Pulses Per Revolution 3). Same as TPPR4, but for FANTACH3. 1 TPPR2 (Tachometer Pulses Per Revolution 2). Same as TPPR4, but for FANTACH2. 0 TPPR1 (Tachometer Pulses Per Revolution 1). Same as TPPR4, but for FANTACH1. Winbond Electronics Corp. Advanced PC Product Center |
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