HD64336900G Datasheet, PDF (107/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

φRC
FTIOA input
capture input
Timer W
TCNT
M-1 M M+1
GRA
N
M
t_A (µs)
M+α
M+α
GRC
N
Capture 1
M
Capture 2
Figure 5.10 Timing Chart of Trimming of Internal RC Oscillator Frequency
The internal RC oscillator frequency is gained by the expression below. Since the input-capture
input is sampled by the φ_RC clock, the calculated result may include a sampling error of ±1 cycle
of the φ_RC clock.
φRC =
(M + α) - M
t_A
(MHz)
φRC: Frequency of internal RC oscillator (MHz)
t_A: Period of reference clock (µs)
M: Timer W counter value
Rev. 1.00, 11/03, page 79 of 376