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參數(shù)資料
| 型號(hào)： | SC1100UFH-266 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Geode⑩ Information Appliance On a Chip |
| 中文描述： | Geode⑩信息家電在一個(gè)芯片 |
| 文件頁(yè)數(shù)： | 57/348頁(yè) |
| 文件大小： | 2063K |
| 代理商： | SC1100UFH-266 |
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Revision 1.1
57
www.national.com
G
General Configuration Block
(Continued)
3.4
The SC1100 provides an accurate time value that can be
used as a time stamp by system software. This time is
called the High-Resolution Timer. The length of the timer
value can be extended via software. It is normally enabled
while the system is in the C0 and C1 states. Optionally,
software can be programmed to enable use of the High-
Resolution Timer during C3 state and/or S1 state as well.
In all other power states the High-Resolution Timer is dis-
abled.
HIGH-RESOLUTION TIMER
3.4.1
The High-Resolution Timer is a 32-bit free-running count-
up timer that uses the oscillator clock or the oscillator clock
divided by 27. Bit TMCLKSEL of the TMCNFG register
(Offset 0Dh[1]) can be set via software to determine which
clock should be used for the High-Resolution Timer.
Functional Description
When the most significant bit (bit 31) of the timer changes
from 1 to 0, bit TMSTS of the TMSTS register (Offset
0Ch[0]) is set to 1. When both bit TMSTS and bit TMEN
(Offset 0Dh[0]) are 1, an interrupt is asserted. Otherwise,
the interrupt is deasserted. This interrupt enables software
emulation of a larger timer.
The High-Resolution Timer interrupt is routed to an IRQ
signal. The IRQ signal is programmable via the INTSEL
register (Offset 38h). For more information about this regis-
ter, see section Section 3.2 "Multiplexing, Interrupt Selec-
tion, and Base Address Registers" on page 50.
System software uses the read-only TMVALUE register
(Offset 08h[31:0]) to read the current value of the timer.
The TMVALUE register has no default value.
The input clock (derived from the 27 MHz crystal oscillator)
is enabled when:
The GX1 module’s internal SUSPA# signal is 1.
or
The GX1 module’s internal SUSPA# signal is 0 and bit
TM27MPD (Offset 0Dh[2]) is 0.
The input clock is disabled, when the GX1 module’s inter-
nal SUSPA# signal is 0 and the TM27MPD bit is 1.
For more information about signal SUSPA# see Section
3.4.2.1 "Usage Hints" and the
GX1 Processor Series
Datasheet
.
The High-Resolution Timer function resides on the internal
Fast-PCI bus and its registers are in General Configuration
Block address space. Only one complete register should
be accessed at a *time (e.g., DWORD access should be
used for DWORD wide registers and byte access should be
used for byte-wide registers).
3.4.2
Table 3-4 on page 58 describes the registers for the High-
Resolution Timer.
High-Resolution Timer Registers
3.4.2.1
Usage Hints
SMM code should set bit 2 of the TMCNFG register to 1
when entering ACPI C3 state if the High-Resolution
Timer should be disabled. If this is not done, the High-
Resolution Timer is functional during C3 state.
SMM code should set bit 2 of the TMCNFG register to 1
when entering ACPI S1 state if the High-Resolution
Timer should be disabled. If this is not done, the High-
Resolution Timer is functional during S1 state.
Offset 04h
Width: Byte
This register contains WATCHDOG status information.
WATCHDOG Status Register - WDSTS (R/WC)
Reset Value: 00h
7:4
3
Reserved.
Write as read.
WDRST (WATCHDOG Reset Asserted). (Read Only)
This bit is set to 1 when WATCHDOG Reset is asserted. It is set to
0 when POR# is asserted, or when the WDOVF bit is set to 0.
WDSMI (WATCHDOG SMI Asserted). (Read Only)
This bit is set to 1 when WATCHDOG SMI is asserted. It is set to 0
when POR# is asserted, or when the WDOVF bit is set to 0.
WDINT (WATCHDOG Interrupt Asserted). (Read Only)
This bit is set to 1 when the WATCHDOG Interrupt is asserted. It
is set to 0 when POR# is asserted, or when the WDOVF bit is set to 0.
WDOVF (WATCHDOG Overflow).
This bit is set to 1 when the WATCHDOG Timer reaches 0. It is set to 0 when POR# is
asserted, or when a 1 is written to this bit by software. Other system reset sources do not affect this bit.
2
1
0
Table 3-3. WATCHDOG Registers (Continued)
Bit
Description
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC1100UFH-300 | Geode⑩ Information Appliance On a Chip |
| SC11372 | MOBILE RADIO ANALOG PROCESSOR |
| SC11372CQ | MOBILE RADIO ANALOG PROCESSOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1100UFH-266 B1 | 制造商:Advanced Micro Devices 功能描述:I3O IC OPN |
| SC1100UFH-300 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Geode⑩ Information Appliance On a Chip |
| SC1101 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:VOLTAGE MODE PWM CONTROLLER |
| SC1101_05 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Asynchronous Voltage Mode PWM Controller |
| SC11014 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:300 / 1200 Bit Per Second Modem |
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