r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 748

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 18 Compare Match Timer (CMT)
18.5.4
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 18.7 shows the timing when the count-up occurs in the T2 cycle while writing to CMCNT
in bytes.
18.5.5
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.
Rev. 1.00 Sep. 21, 2007 Page 722 of 1124
REJ09B0402-0100
Figure 18.7 Conflict between Byte-Write and Count-Up Processes of CMCNT
Conflict between Byte-Write and Count-Up Processes of CMCNT
Compare Match between CMCNT and CMCOR
Peripheral operating
CMCNT count-up
Internal write
clock (Pφ)
CMCNTH
CMCNTL
Address
enable
CMCSR write cycle
X
N
T1
CMCNTH
T2
M (CMCNT write data)
X