| 摘要 |
A clock control circuit is provided to control the frequency of a microprocessor clock signal and includes a clock management unit which controls the frequency of a timing signal applied to a clock generator and distribution unit, which correspondingly supplies an internal clock signal to a CPU core of the microprocessor. A thermal sensor is integrated with the semiconductor die which forms the microprocessor circuit. An output signal from the thermal sensor is provided to a primary temperature indicator unit and to an auxiliary temperature indicator unit. The primary temperature indicator unit is configured to assert a primary indicator signal when the temperature of the semiconductor die has increased above a first threshold level referred to as the primary threshold level, and the auxiliary temperature indicator unit is configured to assert an auxiliary indicator signal when the temperature of the semiconductor die exceeds yet a second threshold level referred to as the auxiliary threshold level. The primary and auxiliary threshold levels may be set by writing to a programmable registers unit. The primary and auxiliary temperature indicator unit are associated with hysteresis characteristics whereby, once either indicator signal has been asserted, it will not be de-asserted until a hysteresis point is reached. |
