Section 18 Timer Unit (TMU)
Rev.1.00 Dec. 13, 2005 Page 675 of 1286
REJ09B0158-0100
18.6 Usage
Notes
18.6.1 Register
Writes
When writing to a TMU register, timer count operation must be stopped by clearing the start bit
(STR5 to STR0) for the relevant channel in TSTR.
Note that TSTR can be written to, and the UNF and ICPF bits in TCR can be cleared while the
count is in progress. When the flags (UNF and ICPF) are cleared while the count is in progress,
make sure not to change the values of bits other than those being cleared.
18.6.2
Reading from TCNT
Reading from TCNT is performed synchronously with the timer count operation. Note that when
the timer count operation is performed simultaneously with reading from a register, the
synchronous processing causes the TCNT value before the count-down operation to be read as the
TCNT value.
18.6.3
Reset RTC Frequency Divider Circuit
When selecting the output clock of the on-chip RTC for the count clock, reset the RTC frequency
divider circuit.
18.6.4 External
Clock
Frequency
Ensure that the external clock (TCLK) input frequency for channels 0, 1 and 2 does not exceed
Pck/4.
Содержание SH7780 Series
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