NUC100LC1BN Nuvoton Technology Corporation of America, NUC100LC1BN Datasheet - Page 324

• Manufacturer Part Number: NUC100LC1BN
• Description: IC MCU 32BIT 32KB FLASH 48LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r

Specifications of NUC100LC1BN

• Core Processor: ARM Cortex-M0
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, LVD, POR, PS2, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

5.8.4
5.8.4.1
5.8.4.2
5.8.4.3
5.8.4.4
5.8.4.5
5.8.4.6
Due to clock difference between RTC clock and system clock, when user write new data to any
one of the registers, the register will not be updated until 2 RTC clocks later (60us).
In addition, user must be aware that RTC controller does not check whether loaded data is out of
bounds or not. RTC does not check rationality between DWR and CLR either.
When RTC controller is power on, user has to write a number (0xA5EB1357) to INIR to reset all
logic. INIR acts as hardware reset circuit. Once INIR has been set as 0xA5EB1357, there is no
action for RTC if any value is programmed into INIR register.
Register AER bit 15~0 is served as RTC read/write password to protect RTC registers. AER bit
15~0 has to be set as 0xA965 to enable access restriction. Once it is set, it will take effect 512
RTC clocks later (about 15ms). Programmer can read RTC enabled status flag in AER.ENF to
check whether if RTC controller start operating or not.
The RTC FCR allows software to make digital compensation to a clock input. The frequency of
clock input must be in the range from 32776Hz to 32761Hz. User can utilize a frequency counter
to measure RTC clock on one of GPIO pin during manufacture, and store the value in Flash
memory for retrieval when the product is first power on. Following are the compensation
examples for higher or lower frequency clock input.
Example 1:
Example 2
TLR and CLR are used to load the time and calendar. TAR and CAR are used for alarm. They are
all represented by BCD.
The 12/24 hour time scale selection depends on TSSR bit 0.
Function Description
Access to RTC register
RTC Initiation
RTC Read/Write Enable
Frequency Compensation
Time and Calendar counter
12/24 hour Time Scale Selection
NuMicro™ NUC100 Series Technical Reference Manual
Frequency counter measurement : 32773.65Hz ( > 32768 Hz)
Integer part: 32773 => 0x8005
FCR.Integer = 0x05 – 0x01 + 0x08 = 0x0c
Fraction part: 0.65 x 60 = 39 => 0x27
FCR.Fraction = 0x27
Frequency counter measurement : 32765.27Hz (
Integer part: 32765 => 0x7FFD
FCR.Integer = 0x0A – 0x01 – 0x08 = 0x04
Fraction part: 0.27 x 60 = 16.2=> 0x10
FCR.Fraction = 0x10
- 324 -
Publication Release Date: Dec. 22, 2010
≦
32768 Hz)
Revision V1.06