stmpe812a STMicroelectronics, stmpe812a Datasheet - Page 18

• Manufacturer Part Number: stmpe812a
• Description: S-touch? Enhanced 4-wire Resistive Touchscreen Controller With Pwm And Dedicated Reset Pin
• Manufacturer: STMicroelectronics

System and identification registers
7
SYS_CTRL
Address:
Type:
Reset:
Description:
18/52
RESERVED
7
0
System and identification registers
Table 8.
If the clock supply to a particular functional block is turned off, the registers of these
modules are not accessible.
SOFT_RESET
[7] RESERVED
[6] SOFT_RESET
[5] TSC_EN
[4] RESERVED
[3] PWM_OFF
[2] GPIO_OFF
[1] TSC_OFF
[0] ADC_OFF
0x00 - 01
0x06 - 07
Address
6
0
0x02
0x03
0x04
0x03
R/W
0x0F
System control register.
Reset the 812 using serial communication
ALL REGISTER VALUES ARE RESET. State machines all back to POR states.
Write ‘1’ to enable operation of TSC. Write ‘0’ to disable it.
Writing ‘1’ switches OFF the clock supply to PWM
Writing ‘1’ switches OFF the clock supply to GPIO
Writing ‘1’ switches OFF the clock supply to touchscreen controller
Writing ‘1’ switches OFF the clock supply to ADC
System and identification registers map
TSC_EN
CHIP_ID
ID_VER
SYS_CTRL
PORT_FUNCTION
SCRATCH_PAD
5
0
Register name
RESERVED
4
0
Doc ID 18225 Rev 2
PWM_OFF
Bit
16
16
8
8
8
3
1
Type
R/W
R/W
R/W
R
R
GPIO_OFF
2
1
0x0A812
Reset
0xF8
0x10
0x00
0x00
System control register
Device identification
Revision number
0x10 for engineering sample
System control register
Port function control register
General purpose storage
register
TSC_OFF
1
1
Function
STMPE812A
ADC_OFF
0
1