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| 型號： | STMPE2401TBR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 24 I/O, PIA-GENERAL PURPOSE, PBGA36 |
| 封裝： | LEAD FREE, TFBGA-36 |
| 文件頁數(shù)： | 14/55頁 |
| 文件大?。?/td> | 959K |
| 代理商： | STMPE2401TBR |
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STMPE2401
Clocking system
21/55
8
Clocking system
Figure 6.
Clocking system
The decision on clocks is based on the bits written into SYSCON registers. Bits 0 to 4 of the
SYSCON register control the gating of clocks to the Rotator, Keypad Controller, PWM and
GPIO respectively in the operational mode. When in sleep mode, the operating clock is cut
off from every functional blocks (including the I2C) except Keypad Controller and GPIO.
8.1
Programming sequence
To put the device in sleep mode, the following needs to be done by the host:
1.
Write a ‘1’ to bit 4 of the SYSCON register.
2.
To wakeup the device, the following needs to be done by the host:
3.
Assert a wakeup routine on the I2C bus by sending the Start Bit, followed by the device
address and the R/W bit.
4.
If there’s a NOACK, keep sending the wakeup routine till there is an ACK from the
slave.
5.
To do a soft reset to the device, the host needs to do the following:
6.
Write a ‘1’ to bit 7 of the SYSCON register.
7.
This bit is automatically cleared upon reset.
8.
To go into Hibernate mode, the following needs to be done by the host:
9.
Set the Disable_32K bit to ‘1’
10. To come out of the Hibernate mode, the following needs to be done by the host:
11. Assert a system reset or
12. Put a wakeup on the I2C
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