Datasheet

Table Of Contents
Section 10 16-Bit Timer Pulse Unit (TPU)
REJ09B0140-0900 Rev. 9.00 Page 347 of 846
Sep 16, 2010
H8S/2215 Group
Contention between Buffer Register Write and Input Capture: If the input capture signal is
generated in the T
2
state of a buffer register write cycle, the buffer operation takes precedence and
the write to the buffer register is not performed. Figure 10.51 shows the timing in this case.
Input capture
signal
Write signal
Address
φ
TCNT
Buffer register write cycle
T
1
T
2
N
TGR
N
M
M
Buffer
register
Buffer register
address
Figure 10.51 Contention between Buffer Register Write and Input Capture
Contention between Overflow/Underflow and Counter Clearing: If overflow/underflow and
counter clearing occur simultaneously, the TCFV/TCFU flag in TSR is not set and TCNT clearing
takes precedence. Figure 10.52 shows the operation timing when a TGR compare match is
specified as the clearing source, and H'FFFF is set in TGR.
Counter
clear signal
TCNT input
clock
φ
TCNT
TGF flag
Prohibited
TCFV flag
H'FFFF H'0000
Figure 10.52 Contention between Overflow and Counter Clearing