Rev. 1.00

5 of 35

May 27, 2011

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

List of Figures

Figure 1. HT32F125x Block Diagram ..................................................................................................... 15

Figure 2. HT32F125x Memory Map........................................................................................................ 16

Figure 3. HT32F125x Clock Structure Diagram...................................................................................... 17

Figure 4. HT32F1251B 48LQFP Pin Assignment ................................................................................... 18

Figure 5. HT32F1251/52/53 48LQFP Pin Assignment............................................................................ 19

Figure 6. I2C Timing Diagram.................................................................................................................. 30

Figure 7. SPI Timing Diagram – SPI Master Mode................................................................................. 31

Figure 8. SPI Timing Diagram – SPI Slave Mode and CPHA=1............................................................. 32