HD64336900G Datasheet, PDF (109/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

5.5.2 Connecting Ceramic Resonator
Figure 5.13 shows an example of connecting a ceramic resonator.
PC0/OSC1
PC1/OSC2/CLKOUT
C₁
C₂
C₁ = C₂ = 5 to 30 pF
Figure 5.13 Example of Connection to Ceramic Resonator
5.5.3 External Clock Input Method
To use the external clock, input the external clock on pin OSC1. Figure 5.14 shows an example of
connection. The duty cycle of the external clock signal must be 45 to 55%.
PC0/OSC1
External clock input
PC1/OSC2/CLKOUT
General port
Figure 5.14 Example of External Clock Input
5.6 Prescaler
5.6.1 Prescaler S
Prescaler S is a 13-bit counter using the system clock (φ) as its input clock. The outputs, which are
divided clocks, are used as internal clocks by the on-chip peripheral modules. Prescaler S is
initialized to H'0000 by a reset, and starts counting on exit from the reset state. In standby mode
and subsleep mode, the system clock pulse generator stops. Prescaler S also stops and is initialized
to H'0000. It cannot be read from or written to by the CPU.
The outputs from prescaler S is shared by the on-chip peripheral modules. The division ratio can
be set separately for each on-chip peripheral module. In active mode and sleep mode, the clock
input to prescaler S is a system clock with the division ratio specified by bits MA2 to MA0 in
SYSCR2.
Rev. 1.00, 11/03, page 81 of 376