Datasheet

78K0/Kx2-L CHAPTER 19 STANDBY FUNCTION
R01UH0028EJ0400 Rev.4.00 640
Sep 27, 2010
19.1.2 Registers controlling standby function
The standby function is controlled by the following two registers.
• Oscillation stabilization time counter status register (OSTC)
• Oscillation stabilization time select register (OSTS)
Remark For the registers that start, stop, or select the clock, refer to CHAPTER 5 CLOCK GENERATOR.
(1) Oscillation stabilization time counter status register (OSTC)
This is the register that indicates the count status of the X1 clock oscillation stabilization time counter. When X1 clock
oscillation starts with the internal high-speed oscillation clock or subsystem clock used as the CPU clock, the X1 clock
oscillation stabilization time can be checked.
OSTC can be read by a 1-bit or 8-bit memory manipulation instruction.
When reset is released (reset by RESET input, POC, LVI, and WDT), the STOP instruction and MSTOP (bit 7 of MOC
register) = 1 clear OSTC to 00H.