HD404449 Datasheet, PDF (62/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 Series
Writing to this register is valid from the second instruction execution cycle after the execution of the
previous timer mode register B1 write instruction. Setting timer B’s initialization by writing to timer
write register B (TWBL: $00A, TWBU: $00B) must be done after a mode change becomes valid.
Timer mode register B1 (TMB1: $009)
Bit
Initial value
Read/Write
Bit name
3
0
W
TMB13
2
0
W
TMB12
1
0
W
TMB11
0
0
W
TMB10
Free-running/reload
TMB13 timer selection
0
Free-running timer
1
Reload timer
Input clock period and input
TMB12 TMB11 TMB10 clock source
0
0
0
2048t_cyc
1
512t_cyc
1
0
128t_cyc
1
32t_cyc
1
0
0
8t_cyc
1
4t_cyc
1
0
2t_cyc
1
R3₃/EVNB (External event input)
Figure 44 Timer Mode Register B1 (TMB1)
• Timer mode register B2 (TMB2: $013): Two-bit read/write register that selects the timer B output
mode as shown in figure 45. It is reset to $0 by MCU reset.
62