W83627DHG Datasheet, PDF (65/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
(2) Two-Times Interrupt Mode
This mode is enabled by setting Bank0 Index 4Ch, bit 6, to zero.
In this mode, the SMI# pin can create an interrupt when the current temperature rises above T_O or
when the current temperature falls below T_HYST. Once the temperature rises above T_O, however,
and generates an interrupt, this mode does not generate additional interrupts, even if the
temperature remains above T_O, until the temperature falls below T_HYST. This interrupt must be
reset by reading all the interrupt status registers, or subsequent events do not generate interrupts.
This is illustrated in the figure above.
7.7.2 OVT# Interrupt Mode
The SMI#/OVT# pin is a multi-function pin. It can be in SMI# mode or in OVT# mode by setting
Configuration Register CR[29h], bit 6 to one or zero, respectively. In OVT# mode, it can monitor
temperatures, and it is enabled or disabled for SYSTIN, CPUTIN, and AUXTIN by Bank0 Index 18h, bit
6; Bank0 Index 4Ch, bit 3; and Bank0 Index 4Ch, bit4.
The OVT# pin has two interrupt modes, comparator and interrupt. The modes are illustrated in this
figure.
To
T_HYST
OVT#
(Comparator Mode; default)
OVT#
(Interrupt Mode)
*
*
*
*Interrupt Reset when Temperature sensor registers are read
If Bank0 Index 18h, bit 4, Bank1 Index 52h, bit 1, and Bank2 Index 52h, bit1 are set to zero, the OVT#
pin is in comparator mode. In comparator mode, the OVT# pin can create an interrupt once the current
temperature exceeds T_O and continues to create interrupts until the temperature falls below T_HYST. The
OVT# pin is asserted once the temperature has exceeded T_O and has not yet fallen below T_HYST.
If Bank0 Index 18h, bit 4, Bank1 Index 52h, bit1, and Bank2 Index 52h, bit 1 are set to one, the OVT#
pin is in interrupt mode. In interrupt mode, the OVT# pin can create an interrupt once the current
temperature rises above T_O or when the temperature falls below T_HYST. Once the temperature rises
above T_O, however, and generates an interrupt, this mode does not generate additional interrupts, even
if the temperature remains above T_O, until the temperature falls below T_HYST. This interrupt must be
reset by reading all the interrupt status registers. The OVT# pin is asserted when an interrupt is
generated and remains asserted until the interrupt is reset.
Publication Release Date: Aug, 22, 2007
-53-
Version 1.4