EP9301-IQZ Cirrus Logic Inc, EP9301-IQZ Datasheet - Page 649
EP9301-IQZ
Manufacturer Part Number
EP9301-IQZ
Description
32-Bit Microcontroller IC
Manufacturer
Cirrus Logic Inc
Series
EP9r
Specifications of EP9301-IQZ
Controller Family/series
(ARM9)
Core Size
32 Bit
A/d Converter
12 Bits
Supply Voltage
3.3V
No. Of I/o Pins
24
Mounting Type
Surface Mount
Operating Temperature Min
-40°C
Package / Case
208-LQFP
Core Processor
ARM9
Speed
166MHz
Connectivity
EBI/EMI, Ethernet, I²C, IrDA, SPI, UART/USART, USB
Peripherals
AC'97, DMA, I²:S, LED, MaverickKey, POR, PWM, WDT
Number Of I /o
19
Program Memory Type
ROMless
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 3.6 V
Data Converters
A/D 5x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Processor Series
EP93xx
Core
ARM920T
Data Bus Width
32 bit
Mounting Style
SMD/SMT
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Details
Other names
598-1250
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Manufacturer
Quantity
Price
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Chapter 20
20Real Time Clock With Software Trim
20
20.1 Introduction
The Real Time Clock (RTC) is a circuit that keeps track of the system date and time. The
RTC operates from the normal device power supply and the 32 kHz input clock. The RTC
circuit operates whenever power is applied to the device and the 32 kHz input clock is
running.
The Real Time Clock section is composed of two blocks - Real Time Clock and the RTC
TRIM.
The RTC module provides second level precision for internal time keeping. In addition, the
block provides an interrupt based on a comparison register. The Real Time Clock block
operates whenever power is applied and the 32 kHz input clock is running. However, the RTC
cannot be used to wake the system via its interrupt when the system is in a STANDBY or
HALT state, where PCLK is inactive.
The RTC TRIM block takes the 32,768 Hz clock from the RTC oscillator and creates a
digitally compensated 1 Hz reference clock for use by the time keeping functions.
Note: The 32,768 Hz clock is referred to as the 32 kHz clock throughout the text.
20.1.1 Software Trim
The Real Time Clock oscillator software compensation circuitry allows software controlled
digital compensation of a 32.768 kHz crystal oscillator. Typically, crystal oscillators must be
externally compensated using discrete components. They are mechanically calibrated during
manufacture. Software controlled digital compensation allows the oscillator to be
electronically calibrated by automatic test equipment during manufacture. The circuit also
enables readjustment in the field under software control.
The RTCSWComp register value is determined by manufacturing during board initialization
to adjust the frequency of the 1 Hz clock. Refer to
Section 20.1.1.1
for details on how to
calculate the value in this register. This value is then stored in FLASH memory for retrieval
when the product is first enabled in the field. The compensation values need to be restored
once the RTC is permanently enabled for field use.
The compensation value consists of two parts: a counter preload value to act as an integer
divider, (RTCSWComp.INT[15:0]), and the number of 32.768 kHz clocks to delete on a
periodic interval (RTCSWComp.DEL[4:0]).
DS785UM1
20-1
Copyright 2007 Cirrus Logic
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