HT32F1251B View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT32F1251B' PDF : 35 Pages View PDF
32-bit ARM Cortexâ„¢-M3 MCU
HT32F1251/51B/52/53
Table 2. HT32F125x Pin Descriptions
Pin
Name
Pins
48
LQFP
Type
(Note1)
IO
Level
(Note2)
Default function
(AF0)
Description
AF1
AF2
AF3
VSSA_2
1
P
Ground reference for ADC and OPA/Comparator
PA0
2
I/O
GPIO PA0
ADC_IN0
GT1_ETI
GT0_CH3
PA1
3
I/O
GPIO PA1
ADC_IN1
GT0_CH2
PA2
4
I/O
GPIO PA2
ADC_IN2
UR_DCD
GT0_CH1
PA3
5
I/O
GPIO PA3
ADC_IN3
UR_DSR
GT0_CH0
PA4
6
I/O
GPIO PA4
ADC_IN4
UR_DTR
SPI_MOSI
PA5
7
I/O
GPIO PA5
ADC_IN5
UR_RI
SPI_MISO
PA6
8
I/O
GPIO PA6
ADC_IN6
UR_RTS/TXE SPI_SCK
PA7
9
I/O
GPIO PA7
ADC_IN7
UR_CTS/SCK SPI_SEL
PA8
10
I/O
5V-T
GPIO PA8
UR_RX
PA9
11
I/O
5V-T
GPIO PA9-BOOT0
UR_TX
PA10 12
I/O
5V-T
GPIO PA10-BOOT1
VLDOOUT 13
P
LDO 1.8 V output. Please put a 10μF capacitor to GND in those pins
as close as possible.
N.C
14
VLDOIN
15
P
LDO 3.3 V power source, also connected to the power switch of the
backup domain.
VSSLDO
16
P
LDO ground reference
nRST 17
I
(Backup 5V-T
domain)
External reset pin and external wakeup pin in Power-Down mode
VBAT(note3) 18
P
VDD 3.3 V for backup domain
PB8(note3) 19
I/O
(Backup
domain)
XTAL32KIN
PB8
PB9(note3) 20
I/O
(Backup
domain)
XTAL32KOUT
PB9
PB10 21
I/O
(Backup 5V-T
domain)
RTCOUT
PB10-
WAKEUP
GT0_ETI
PB11 22
I/O
5V-T
GPIO PB11
CKOUT
GT0_CH3
PA11 23
I/O
5V-T
GPIO PA11
I2C_SCL
PA12 24
I/O
5V-T
GPIO PA12
I2C_SDA
PA13 25
I/O
5V-T
SWDIO
PA13
GT0_CH2
PA14 26
I/O
5V-T
SWCLK
PA14
GT0_CH1
PA15 27
I/O
5V-T
TRACESWO
PA15
GT0_CH0
VDD33_2
28
P
3.3 V voltage for digital I/O
VSS33_2
29
P
Ground reference for digital I/O
VSS33_3
30
P
Ground reference for digital core
PB12 31
I/O
5V-T
GPIO PB12
SPI_SEL
UR_DCD
GT1_CH3
Rev. 1.10
20 of 35
April 13, 2012
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