I 2 C Timeout Register - I2Ctout - Holtek HT32F50231 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F50231/HT32F50241
I 2 C Timeout Register – I2CTOUT
This register specifies the I 2 C Timeout counter preload value and clock prescaler ratio.
Offset: 0x028
Reset value: 0x0000_0000
31
Type/Reset
23
Type/Reset
15
Type/Reset RW 0 RW
7
Type/Reset RW 0 RW
Bits Field
[18:16] PSC
[15:0] TOUT
Rev. 1.00
30 29 28
22 21 20
Reserved
14 13 12
0 RW 0 RW
6 5 4
0 RW 0 RW
Descriptions
I 2 C Timeout Counter Prescaler Selection
This PSC field is used to specify the I
timeout clock frequency is obtained using the formula.
= f
f
PCLK
I2CTO
2 PSC
PSC = 0 → f = f / 2
I2CTO PCLK
PSC = 1 → f = f / 2
I2CTO PCLK
PSC = 2 → f = f / 2
I2CTO PCLK
...
PSC = 7 → f = f / 2
I2CTO PCLK
I 2 C Timeout Counter Preload Value
The TOUT field is used to define the counter preloaded value
The counter value is reloaded when any of the following conditions occurs:
1. The RXBF, TXDE, RXDNE, RXNACK, GCS or ADRS flag in the I2CSR register
is asserted.
2. The I 2 C master module sends a START signal.
3. The I 2 C slave module detects a START signal.
The counter stops counting when any of the following conditions occurs:
1. The I 2 C slave device is not addressed.
2. The I C master module sends a STOP signal.
2
3. The I 2 C slave module detects a STOP signal.
4. The ARBLOS or BUSERR flag in the I2CSR register is asserted.
419 of 486
27 26
Reserved
19 18
RW 0 RW
11 10
TOUT
0 RW 0 RW 0 RW
3 2
TOUT
0 RW 0 RW 0 RW
2 C timeout counter clock frequency, f
0 = f
PCLK
1 = f / 2
PCLK
2 = f / 4
PCLK
7 = f / 128
PCLK
25 24
17 16
PSC
0 RW 0
9 8
0 RW 0
1 0
0 RW 0
. The
I2CTO
July 31, 2018