CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U19014EJ1V0UD
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(9) USB clock control register (UCKC)
This register controls the clock supplied to the USB macro.
UCKC can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 00H.
Figure 5-10. Format of USB Clock Control Register (UCKC)
Address: FFA7H After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1 0
UCKC
UCKCNT
0 0 0 0 0 0 0
UCKCNT
USB macro clock supply control
0
Clock supply to USB macro stopped
1
Clock supplied to USB macro
Caution Before shifting to the STOP mode, stop the clock supply to the USB macro.
After the STOP mode is released, count the PLL oscillation stabilization time (800
µ
s) using software, and supply the clock to the USB macro after the oscillation
stabilization wait time has elapsed.
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