Manual
Table Of Contents
- 1 GENERAL DESCRIPTION
- 2 FEATURES
- 3 PARTS INFORMATION LIST AND PIN CONFIGURATION
- 4 BLOCK DIAGRAM
- 5 FUNCTIONAL DESCRIPTION
- 5.1 ARM® Cortex™-M0 core
- 5.2 System Manager
- 5.3 Clock Controller
- 5.4 USB Device Controller
- 5.5 General Purpose I/O
- 5.6 I2C Serial Interface Controller (Master/Slave)
- 5.7 PWM Generator and Capture Timer
- 5.8 Real Time Clock (RTC)
- 5.9 Serial Peripheral Interface (SPI) Controller
- 5.10 Timer Controller
- 5.11 Watchdog Timer
- 5.12 UART Interface Controller
- 5.13 Controller Area Network (CAN Bus)
- 5.14 PS2 Device Controller (PS2D)
- 5.15 I2S Controller
- 5.16 Analog-to-Digital Converter (ADC)
- 5.17 Analog Comparator
- 5.18 PDMA Controller
- 6 FLASH MEMORY CONTROLLER (FMC)
- 7 ELECTRICAL CHARACTERISTICS
- 7.1 Absolute Maximum Ratings
- 7.2 DC Electrical Characteristics
- 7.3 AC Electrical Characteristics
- 7.4 Analog Characteristics
- 7.4.1 Specification of 12-bit SARADC
- 7.4.2 Specification of LDO & Power management
- 7.4.3 Specification of Low Voltage Reset
- 7.4.4 Specification of Brownout Detector
- 7.4.5 Specification of Power-On Reset (5V)
- 7.4.6 Specification of Temperature Sensor
- 7.4.7 Specification of Comparator
- 7.4.8 Specification of USB PHY
- 8 PACKAGE DIMENSIONS
- 9 REVISION HISTORY
NUC140 Series DATA SHEET
5.3.2 System Clock & SysTick Clock
The system clock has 5 clock sources which were generated from clock generator block. The clock
source switch depends on the register HCLK_S(CLKSEL0[2:0]). The block diagram lists below.
011
010
001
000
1xx
10K
PLLFOUT
32K
12M
22M
HCLK_S(CLKSEL0[2:0])
CPU in Power Down Mode
1/(HCLK_N+1)
HCLK_N(CLKDIV[3:0])
HCLK
CPUCLK
PCLK
CPU
AHB
APB
Figure 5-3 System Clock Block Diagram
The SysTick clock(STCLK) has 5 clock sources which were generated from clock generator block.
The clock source switch depends on the setting of the register STCLK_S(CLKSEL0[5:3]. The block
diagram lists below.
STCLK
011
010
001
000
1xx
HCLK
12M
32K
12M
22M
STCLK_S(CLKSEL0[5:3])
1/2
1/2
1/2
Figure 5-4 SysTick clock Control Block Diagram
Publication Release Date: May 31, 2010
- 31 - Revision V1.02