UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 653

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

22.2.2 Oscillation Stabilization Time Specification Register (OSTS)
EXTC bit of the OSTS specifies whether crystal/ceramic oscillation or an external clock is used. STOP mode can be set
when external clock input is used only when the EXTC bit is set (1).
an oscillation stabilization time of at least 40ms should be selected when a crystal resonator is used, and at least 4 ms
when a ceramic oscillator is used.
capacitance of the connected capacitor. Therefore, if you want to set a short oscillation stabilization time, you should consult
the crystal resonator or ceramic resonator manufacturer.
The OSTS specifies the oscillator operation and the oscillation stabilization time when STOP mode is released. The
Bits OSTS0 to OSTS2 of the OSTS select the oscillation stabilization time when STOP mode is released. In general,
The time taken for oscillation stabilization is affected by the crystal resonator or ceramic resonator used, and the
The OSTS can be written to only with an 8-bit transfer instruction.
RESET input clears the OSTS register to 00H.
The format of the OSTS is shown in Figure 22-4.
CHAPTER 22 STANDBY FUNCTION
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