HD404369F datasheet(62/117 Pages) RENESAS

62 / 117 page

HD404369 Series

• 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 40. 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.

When selecting the input capture timer operation, select the internal clock as the input clock source.

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

D2/EVNB (external event input)

TMB13

Free-Running/Reload

Timer Selection

Free-running timer

Reload timer

Figure 40 Timer Mode Register B1 (TMB1)

• Timer mode register B2 (TMB2: $026): Three-bit write-only register that selects the detection edge of

signals input to pin EVNB and input capture operation as shown in figure 41. It is reset to $0 by MCU

reset.

• Timer write register B (TWBL: $00A, TWBU: $00B): Write-only register consisting of the lower digit

(TWBL) and the upper digit (TWBU). The lower digit is reset to $0 by MCU reset, but the upper digit

value is invalid (figures 42 and 43).

Timer B is initialized by writing to timer write register B (TWBL: $00A, TWBU: $00B). In this case,

the lower digit (TWBL) must be written to first, but writing only to the lower digit does not change the

timer B value. Timer B is initialized to the value in timer write register B at the same time the upper

digit (TWBU) is written to. When timer write register B is written to again and if the lower digit value

needs no change, writing only to the upper digit initializes timer B.

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