UPD784938 Datasheet, PDF (512/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 21 CLOCK OUTPUT FUNCTION
(1) Clock output mode register (CLOM)
Register that controls the operation of the clock output function.
(2) Selector 1
Selector that selects the frequency of the clock to be output.
(3) Output control
Controls the output signal in accordance with the contents of the clock output mode register (CLOM).
(4) Selector 2
Selects either the ASTB signal or the CLOCKOUT signal as the signal to be output to the ASTB/CLOCKOUT pin.
(5) ASTB/CLOCKOUT pin
Pin that outputs the signal selected by selector 2. While the RESET input is low, the ASTB/CLOCKOUT pin is in the
Hi-Z state, and when the RESET input becomes high, it outputs a low-level signal, and then outputs a signal according
to the set function.
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Preliminary User’s Manual U13987EJ1V0UM00