HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 378
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HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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11.
11.7.17 Contention between TCNT Write and Overflow/Underflow
If there is an up-count or down-count in the T2 state of a TCNT write cycle, and
overflow/underflow occurs, the TCNT write takes precedence and the TCFV/TCFU flag in TSR is
not set.
Figure 11.84 shows the operation timing when there is contention between TCNT write and
overflow.
11.7.18 Cautions on Transition from Normal Operation or PWM Mode 1 to Reset-
When making a transition from channel 3 or 4 normal operation or PWM mode 1 to reset-
synchronous PWM mode, if the counter is halted with the output pins (TIOC3B, TIOC3D,
TIOC4A, TIOC4C, TIOC4B, TIOC4D) in the high-impedance state, followed by the transition to
reset-synchronous PWM mode and operation in that mode, the initial pin output will not be
correct.
When making a transition from normal operation to reset-synchronous PWM mode, write H'11 to
registers TIORH_3, TIORL_3, TIORH_4, and TIORL_4 to initialize the output pins to low level
output, then set an initial register value of H'00 before making the mode transition.
When making a transition from PWM mode 1 to reset-synchronous PWM mode, first switch to
normal operation, then initialize the output pins to low level output and set an initial register value
of H'00 before making the transition to reset-synchronous PWM mode.
Rev.4.00 Mar. 27, 2008 Page 334 of 882
REJ09B0108-0400
Multi-Function Timer Pulse Unit (MTU)
Synchronous PWM Mode
Figure 11.84
Address
Write signal
TCNT
TCFV flag
Pφ
Contention between TCNT Write and Overflow
H'FFFF
TCNT write cycle
T1
TCNT address
T2
M
TCNT write data
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