Renesas H8S/2111B 用户手册
Rev. 1.00, 05/04, page 176 of 544
9.5.10
Mask Signal Generation Timing
When the ICRDMS bit in TOCR is set to 1 and the contents of OCRDM are other than H'0000, a
signal that masks the ICRD input capture signal is generated. The mask signal is set by the input
capture signal. The mask signal is cleared by the sum of the ICRD contents and twice the
OCRDM contents, and an FRC compare-match. Figure 9.15 shows the timing of setting the mask
signal. Figure 9.16 shows the timing of clearing the mask signal.
signal that masks the ICRD input capture signal is generated. The mask signal is set by the input
capture signal. The mask signal is cleared by the sum of the ICRD contents and twice the
OCRDM contents, and an FRC compare-match. Figure 9.15 shows the timing of setting the mask
signal. Figure 9.16 shows the timing of clearing the mask signal.
Input capture
signal
signal
Input capture
mask signal
mask signal
φ
Figure 9.15 Timing of Input Capture Mask Signal Setting
Compare-match
signal
signal
Input capture
mask signal
mask signal
ICRD + OCRDM
× 2
N
FRC
N
N + 1
φ
Figure 9.16 Timing of Input Capture Mask Signal Clearing