Rev. 1.0, 09/02, page 289 of 568
TCNT write
Writing to RSTE and RSTS bits
TCSR write
Writing 0 to WOVF bit
Address:
Address:
15
8
7
0
H'5A
H'FF74
H'FF76
Write data
15
8
7
0
H'5A
H'FF74
H'FF76
Write data or H'00
Figure 13.3 Writing to TCNT, TCSR, and RSTCSR (example for WDT0)
Reading TCNT, TCSR, and RSTCSR (WDT0): These registers are read in the same way as
other registers. The read addresses are H
′
FF74 for TCSR, H
′
FF75 for TCNT, and H
′
FF77 for
RSTCSR.
13.5.2
Conflict between Timer Counter (TCNT) Write and Increment
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the write
takes priority and the timer counter is not incremented. Figure 13.4 shows this operation.
Address
φ
Internal write signal
TCNT input clock
TCNT
N
M
T1
T2
TCNT write cycle
Counter write data
Figure 13.4 Conflict between TCNT Write and Increment
Summary of Contents for H8S/2627
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