HD4046212RFS datasheet(68/157 Pages) RENESAS

68 / 157 page

HD404629R Series

Bit

Initial value

Read/Write

Bit name

—

Not used

—

Not used

R/W

TMB20

R/W

TMB21

Timer mode register B2 (TMB2: $013)

TMB21

TMB20

R10/TOB mode selection

R10

TOB

R10 port

Toggle output

0 output

1 output

Figure 48 Timer Mode Register B2 (TMB2)

• Timer mode register B2 (TMB2: $013): Two-bit read/write register that selects the timer B output

mode as shown in figure 48. 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) as shown in figures 49 and 50. The lower digit is reset to $0 by

MCU reset, but the upper digit value is invalid.

Timer B is initialized by writing to timer write register B. 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 49 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 50 Timer Write Register B Upper Digit (TWBU)

• 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 51 and 52).

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