E202075_HD404889 Datasheet, PDF (90/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
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 39.
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.
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