STMPE821 Datasheet, PDF (16/55 Pages) STMicroelectronics – 8-bit Xpander Logic™ with touchkey controller

System and identification registers
STMPE821
SYS_CFG_1
7
6
5
RESERVED
System configuration 1
4
3
2
SLEEP
WARM_RESET
1
SOFT_RESET
0
HIBERNATE
Address:
0x03
Type:
R/W
Reset:
0x00
Description:
The reset control register enables to reset the device
[7:4] RESERVED
[3] SLEEP:
Write ‘1’ to enable sleep mode
[2] WARM_RESET:
Write ‘1’ to initiate a warm reset. Register content remains, state machine reset.
[1] SOFT_RESET:
Write ‘1’ to initiate a soft reset. All registers content and state machines reset.
[0] HIBERNATE: Force the device into hibernation mode.
Write ‘1’ to enter the hibernate mode,
SYS_CFG_2
System configuration 2
7
SENSOR
CLOCK 2
6
SENSOR
CLOCK 1
5
SENSOR
CLOCK 0
4
3
2
−
PWM CLOCK
DISABLE
GPIO CLOCK
DISABLE
1
FIFO CLOCK
DISABLE
0
TOUCH CLOCK
DISABLE
Address:
0x04
Type:
R/W
Reset:
0xEF
Description:
This register enables to switch off the clock supply
[7:5] SENSOR CLOCK: See description in the table below.
[4] RESERVED
[3] PWM CLOCK DISABLE:
Write ‘1’ to disable the clock to PWM unit.
[2] GPIO CLOCK DISABLE:
Write ‘1’ to disable the clock to GPIO unit. Note that GPIO clock is required for PWM operation.
[1] FIFO CLOCK DISABLE:
Write ‘1’ to disable the clock to FIFO unit. This must be set to ‘0’ if touch interrupt is required.
[0] TOUCH CLOCK DISABLE:
Write ‘1’ to disable the clock to TOUCH unit.
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