LAN9118MT Standard Microsystems (SMSC), LAN9118MT Datasheet - Page 39
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LAN9118MT
Manufacturer Part Number
LAN9118MT
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN9118MT.pdf
(170 pages)
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High-Performance Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9118
4.8
The General Purpose Timer is a programmable block that can be used to generate periodic host
interrupts. The resolution of this timer is 100uS.
The GP Timer loads the GPT_CNT Register with the value in the GPT_LOAD field and begins counting
down when the TIMER_EN bit is set to a ‘1.’ On a reset, or when the TIMER_EN bit changes from
set ‘1’ to cleared ‘0,’ the GPT_CNT field is initialized to FFFFh. The GPT_CNT register is also initialized
to FFFFh on a reset. Software can write the pre-load value into the GPT_LOAD field at any time; e.g.,
before or after the TIMER_EN bit is asserted. The GPT Enable bit TIMER_EN is located in the
GPT_CFG register.
Once enabled, the GPT counts down either until it reaches 0000h or until a new pre-load value is
written to the GPT_LOAD field. At 0000h, the counter wraps around to FFFFh, asserts the GPT
interrupt status bit and the IRQ signal if the GPT_INT_EN bit is set, and continues counting. The GPT
interrupt status bit is in the INT_STS Register. The GPT_INT hardware interrupt can only be set if the
GPT_INT_EN bit is set. GPT_INT is a sticky bit (R/WC); i.e., once the GPT_INT bit is set, it can only
be cleared by writing a ‘1’ to the bit.
General Purpose Timer (GP Timer)
DATASHEET
39
Revision 1.0 (03-17-05)
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