Section 14 Compare Match Timer (CMT)
Rev. 3.00 Sep. 27, 2007 Page 510 of 758
REJ09B0243-0300
14.5.4
Conflict between Byte-Write and Count-Up Processes of CMCNT
Even when the count-up occurs in the T2 cycle while writing to CMCNT in bytes, the byte-writing
has priority over the count-up. In this case, the count-up is not performed. The byte data on
another side, which is not written to, is also not counted and the previous contents remain.
Figure 14.7 shows the timing when the count-up occurs in the T2 cycle while writing to CMCNT
in bytes.
M (CMCNT write data)
X
X
CMCNTH
CMCNT count-up
enable
CMCNTH
CMCNTL
Peripheral operating
clock (P
φ
)
Address
Internal write
T1
T2
N
CMCSR write cycle
Figure 14.7 Conflict between Byte-Write and Count-Up Processes of CMCNT
14.5.5
Compare Match between CMCNT and CMCOR
Do not set the same value in CMCNT and CMCOR while CMCNT is not counting. If set, the
CMF bit in CMCSR is set to 1 and CMCNT is cleared to H'0000.
Содержание SH7124 R5F7124
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