570
WDT0 TCSR Bit 3—Reserved Bit: This bit is always read as 1 and cannot be modified.
WDT1 TCSR Bit 3—Reset or NMI (RST/
NMI
): This bit is used to choose between an internal
reset request and an NMI request when the TCNT overflows during the watchdog timer mode.
Bit 3
RTS/
NMI
Description
0
NMI request.
(Initial value)
1
Internal reset request.
Bits 2 to 0: Clock Select 2 to 0 (CKS2 to CKS0): These bits select one of eight internal clock
sources, obtained by dividing the system clock (ø) or subclock (ø SUB), for input to TCNT.
WDT0 Input Clock Select
Description
Bit 2
CKS2
Bit 1
CKS1
Bit 0
CKS0
Clock
Overflow Period* (where ø = 25 MHz)
0
0
0
ø/2 (initial value)
20.4 µs
1
ø/64
652.8 µs
1
0
ø/128
1.3 ms
1
ø/512
5.2 ms
1
0
0
ø/2048
20.9 ms
1
ø/8192
83.6 ms
1
0
ø/32768
334.2 ms
1
ø/131072
1.34 s
Note:
*
An overflow period is the time interval between the start of counting up from H'00 on the
TCNT and the occurrence of a TCNT overflow.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...