HD64F38024HV Datasheet, PDF (136/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 4 Clock Pulse Generators
Prescaler W (PSW)
Prescaler W is a 5-bit counter using a 32.768 kHz/38.4 kHz signal divided by 4 (φ_W/4) as its input
clock.
Prescaler W is initialized to H'00 by a reset, and starts counting on exit from the reset state.
Even in standby mode, watch mode, subactive mode, or subsleep mode, prescaler W continues
functioning so long as clock signals are supplied to pins X1 and X2.
Prescaler W can be reset by setting 1s in bits TMA3 and TMA2 of timer mode register A (TMA).
Output from prescaler W can be used to drive timer A, in which case timer A functions as a time
base for timekeeping.
Rev. 8.00 Mar. 09, 2010 Page 114 of 658
REJ09B0042-0800