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STMPE2403 数据表(PDF) 23 Page - STMicroelectronics

部件名 STMPE2403
功能描述  24-bit Enhanced port expander with Keypad and PWM controller Xpander logic
PDF  63 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STMPE2403 数据表(HTML) 23 Page - STMicroelectronics

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STMPE2403
Clocking system
23/63
8
Clocking system
Figure 5.
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.
8.1
Clock source
By default, when the STMPE2403 powers up, it derives a 32KHz clock from the internal RC
oscillator for it's operation. If external 32KHz crystal or clock source is available, it must be
configured to accept external clock through the SYSCON register.
In the case where the STMPE2403 is powered and configured to use external clock, and the
XTALIN is left floating, there will be an additional leakage current of approximately 20
µA
drawn from the VCC.



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