HD404369F datasheet(63/117 Pages) RENESAS

63 / 117 page

HD404369 Series

• Timer read register B (TRBL: $00A, TRBU: $00B): Read-only register consisting of the lower digit

(TRBL) and the upper digit (TRBU) that holds the count of the timer B upper digit (figures 44 and 45).

The upper digit (TRBU) must be read first. At this time, the count of the timer B upper digit is obtained,

and the count of the timer B lower digit is latched to the lower digit (TRBL). After this, by reading

TRBL, the count of timer B when TRBU is read can be obtained.

When the input capture timer operation is selected and if the count of timer B is read after a trigger is

input, either the lower or upper digit can be read first.

• Port mode register B (PMRB: $024): Write-only register that selects D

2/EVNB pin function as shown in

figure 46. It is reset to $0 by MCU reset.

Bit

Initial value

Read/Write

Bit name

—

Not used

TMB22

TMB20

TMB21

Timer mode register B2 (TMB2: $026)

TMB21

TMB20

EVNB Edge Detection Selection

No detection

Falling edge detection

Rising edge detection

Rising and falling edge detection

TMB22

Free-Running/Reload and Input Capture Selection

Free-running/reload

Input capture

Figure 41 Timer Mode Register B2 (TMB2)

Bit

Initial value

Read/Write

Bit name

TWBL3

TWBL2

TWBL0

TWBL1

Timer write register B (lower digit) (TWBL: $00A)

Figure 42 Timer Write Register B Lower Digit (TWBL)

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