lpc47s457-ns Standard Microsystems Corp., lpc47s457-ns Datasheet - Page 104
lpc47s457-ns
Manufacturer Part Number
lpc47s457-ns
Description
Advanced I/o With X-bus Interface
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LPC47S457-NS.pdf
(259 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC47S457-NS
Manufacturer:
Microchip Technology
Quantity:
10 000
- Current page: 104 of 259
- Download datasheet (2Mb)
setting of the time. When the divider chain is changed from reset to the operating mode, the first update cycle is
one-half second later.
Periodic Interrupt Selection
The periodic interrupt allows the IRQB port to be triggered from once every 500 ms to once every 122.07 μs. As
Table 51 shows, the periodic interrupt is selected with the RS0-RS3 bits in Register A. The periodic interrupt is
enabled with the PIE bit in Register B.
6.9.8
The XOSEL pin is used to select either a 32.768kHz input clock or a 32.768kHz crystal to drive the Real Time Clock
Interface).
When XOSEL = ‘0’, the RTC uses a 32.768kHz crystal connected between the XTAL1 and XTAL2 pins. When
XOSEL = ‘1’, the RTC is driven by a 32.768kHz single-ended clock source connected to the XTAL2 pin.
Note: Standby current on Vbat is <1µA.
6.9.9
The RTC and CMOS RAM utilize VBAT power plane.
The VTR POR does not affect the clock, calendar, or RAM functions. When VTR POR is active, the following occurs:
If both the main power (VTR) and the battery power (VBAT) are both low at the same time and then re-applied (i.e. a
new battery is installed) the following occurs:
Initialize all registers 00-0D to a “00” when VTR is applied.
The oscillator is disabled immediately.
The VRT bit is cleared to “0”.
When PWRGD = 0, all host inputs are locked out so that the internal registers cannot be modified by the host system.
The Host lockout condition continues for 500usec (min) to 1msec (max) after PWRGD =1. The Host lockout condition
does not occur when either of the following occurs:
-
-
SMSC DS – LPC47S45x
Periodic Interrupt Enable (PIE) is cleared to “0”.
Alarm Interrupt Enable (AIE) bit is cleared to “0”.
Update Ended Interrupt Enable (UIE) bit is cleared to “0”.
Update Ended Interrupt Flag (UF) bit is cleared to “0”.
Interrupt Request status Flag (IRQF) bit is cleared to “0”.
Periodic Interrupt Flag (PIF) is cleared to “0”.
The RTC and CMOS registers are not accessible.
Alarm Interrupt Flag (AF) is cleared to “0”.
RTC IRQ is not enabled
RTC Divider Selection mode is not in normal mode in Table 50.
The VRT bit in Register D is a "0".
32KHZ CLOCK INPUT
POWER MANAGEMENT
DATASHEET
Page 104 of 259
Rev. 04-30-07
Related parts for lpc47s457-ns
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Interface, Integrated USB2.0 Compatible 3-Port Hub
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Lan91c100fd Rev. B Feast Fast Ethernet Controller With Full Duplex Capability
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Feast ? Ast Ethernet Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Com20022i 10 Mbps Arcnet Ansi 878.1 Controller With 2k X 8 On-chip Ram
Manufacturer:
Standard Microsystems Corp.
Part Number:
Description:
Lpc47n207 Lpc Super I/o Irda Hot Docking Chip With Uart Data Brief
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Twenty Pin Uart Tpuart Corporation
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Enhanced Small Device Interface Controller
Manufacturer:
Standard Microsystems Corp.
Part Number:
Description:
Rpm-based Pwm Fan Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Rpm-based Pwm Fan Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Emc1001 1.5?c Smbus Temperature Sensor In Miniature Sot-23
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Triple Temperature Sensor With Beta Compensation And Hotter Of Two Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Multiple Temperature Sensor With Beta Compensation And Hottest Of Thermal Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Triple Temperature Sensor With Resistance Error Correction & Hotter Of Two Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Triple Temperature Sensor With Hotter Of Two Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet: