Datasheet

Table Of Contents
Section 10 16-Bit Timer Pulse Unit (TPU)
Page 348 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
Contention between TCNT Write and Overflow/Underflow: If there is an up-count or down-
count in the T
2
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 10.53 shows the operation timing
when there is contention between TCNT write and overflow.
Write signal
Address
φ
TCNT address
TCNT
TCNT write cycle
T
1
T
2
H'FFFF M
TCNT write data
TCFV flag
Prohibited
Figure 10.53 Contention between TCNT Write and Overflow
Multiplexing of I/O Pins: In this LSI, the TCLKA input pin is multiplexed with the TIOCC0 I/O
pin, the TCLKB input pin with the TIOCD0 I/O pin, the TCLKC input pin with the TIOCB1 I/O
pin, and the TCLKD input pin with the TIOCB2 I/O pin. When an external clock is input,
compare match output should not be performed from a multiplexed pin.
Interrupts and Module Stop Mode: If module stop mode is entered when an interrupt has been
requested, it will not be possible to clear the CPU interrupt source or the DTC activation source.
Interrupts should therefore be disabled before entering module stop mode.
Module Stop Mode Setting: TPU operation can be disabled or enabled using the module stop
control register. The initial setting is for TPU operation to be halted. Register access is enabled by
clearing module stop mode. For details, refer to section 22, Power-Down Modes.