HD4046212RFS datasheet(67/157 Pages) RENESAS

67 / 157 page

HD404629R Series

Registers for Timer B Operation: By using the following registers, timer B operation modes are selected

and the timer B count is read and written.

 Timer mode register B1 (TMB1: $009)

 Timer mode register B2 (TMB2: $013)

 Timer write register B (TWBL: $00A, TWBU: $00B)

 Timer read register B (TRBL: $00A, TRBU: $00B)

 Port mode register C (PMRC: $025)

• Timer mode register B1 (TMB1: $009):

Four-bit write-only register that selects the free-running/reload timer function, input clock source, and

the prescaler division ratio as shown in figure 47. It is reset to $0 by MCU reset.

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.

Bit

Initial value

Read/Write

Bit name

TMB13

TMB12

TMB10

TMB11

Timer mode register B1 (TMB1: $009)

2048tcyc

512tcyc

128tcyc

32tcyc

8tcyc

4tcyc

2tcyc

TMB12

TMB10

TMB11

Input clock period and input

clock source

R13/EVNB (external event input)

TMB13

Free-running/reload

timer selection

Free-running timer

Reload timer

Figure 47 Timer Mode Register B1 (TMB1)

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