HD404848FS datasheet(65/127 Pages) RENESAS

65 / 127 page

HD404849 Series

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.

Bit

Initial value

Read/Write

Bit name

TWBL3

TWBL2

TWBL0

TWBL1

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

Figure 46 Timer Write Register B Lower Digit (TWBL)

Bit

Initial value

Read/Write

Bit name

Undefined

TWBU3

Undefined

TWBU2

Undefined

TWBU0

Undefined

TWBU1

Timer write register B (upper digit) (TWBU: $00B)

Figure 47 Timer Write Register B Upper Digit (TWBU)

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

(TRBL) and upper digit (TRBU) that holds the count of the timer B upper digit. See figures 48 and 49.

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 was read can be obtained.

Bit

Initial value

Read/Write

Bit name

Undefined

TRBL3

Undefined

TRBL2

Undefined

TRBL0

Undefined

TRBL1

Timer read register B (lower digit) (TRBL: $00A)

Figure 48 Timer Read Register B Lower Digit (TRBL)

HD404848FS Datasheet(PDF) 65 Page - Renesas Technology Corp

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