HD404374FT datasheet(77/161 Pages) RENESAS

77 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 77 of 161

• Timer mode register B2 (TMB2: $011):

Timer mode register B2 (TMB2) is a 3-bit write-only register, used to select the timer B output mode

and EVNB pin detected edge as shown in figure 37.

Timer mode register B2 (TMB2) is reset to $0 by an MCU reset.

TMB20

EVNB pin detected edge

Not detected

Falling edge detection

Rising edge detection

Both rising and falling edge detection

TMB22

Timer B output waveform

Toggle output

PWM output

TMB21

Timer mode register B2 (TMB2: $011)

Bit

Read/Write

Initial value on reset

Bit name

—

TMB22

TMB21

TMB20

Figure 37 Timer Mode Register B2 (TMB2)

• Timer write register B (TWBL: $012, TWBU:$013):

Timer write register B (TWBL, TWBU) is a write-only register composed of a lower digit (TWBL) and

an upper digit (TWBU) (figures 38 and 39).

The lower digit (TWBL) of timer write register B is reset to $0 by an MCU reset, while the upper digit

(TWBU) is undetermined.

Timer B can be initialized by writing to timer write register B (TWBL, TWBU). To write the data, first

write the lower digit (TWBL). The lower digit write does not change the timer B value. Next, write the

upper digit (TWBU). Timer B is then initialized to the timer write register B (TWBL, TWBU) value.

When writing to timer write register B (TWBL, TWBU) from the second time onward, if it is not

necessary to change the lower digit (TWBL) reload value, timer B initialization is completed by the

upper digit write alone.

HD404374FT Datasheet(PDF) 77 Page - Renesas Technology Corp