HD404374FT datasheet(76/161 Pages) RENESAS

76 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 76 of 161

Timer B Registers

Timer B operation setting and timer B value reading/writing is controlled by the following registers.

Timer mode register B1 (TMB1: $010)

Timer mode register B2 (TMB2: $011)

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

Timer read register B (TRBL: $012, TRBU: $013)

Port mode register 2 (PMR2: $00A)

Module standby register 1 (MSR1: $00D)

• Timer mode register B1 (TMB1: $010):

Timer mode register B1 (TMB1) is a 4-bit write-only register, used to select free-running/reload timer

operation and the input clock as shown in figure 36.

Timer mode register B1 (TMB1) is reset to $0 by an MCU reset:

A modification of timer mode register B1 (TMB1) becomes effective after execution of two instructions

following the timer mode register B1 (TMB1) write instruction. The program must provide for timer B

initialization by writing to timer write register B (TWBL, TWBU) to be executed after the post-

modification mode has become effective.

TMB13

TMB12

TMB11

TMB10

Bit

Read/Write

Initial value on reset

Bit name

TMB12

TMB11

TMB10

Input clock period and input clock source

2,048 tcyc

512 tcyc

128 tcyc

32 tcyc

8 tcyc

4 tcyc

2 tcyc

R10/EVNB (external event input)

TMB13

Free-running/reload timer

Free-running timer

Reload timer

Timer mode register B1 (TMB1: $010)

Figure 36 Timer Mode Register B1 (TMB1)

HD404374FT Datasheet(PDF) 76 Page - Renesas Technology Corp

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