E202075_HD404889 Datasheet, PDF (99/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Timer C Registers
Timer C operation setting and timer C value reading/writing is controlled by the following registers.
Timer mode register C1 (TMC1: $014)
Timer mode register C2 (TMC2: $015)
Timer write register C (TWCL: $016, TWCU: $017)
Timer read register C (TRCL: $016, TRCU: $017)
Port mode register 3 (PMR3: $00B)
Module standby register 1 (MSR1: $00D)
• Timer mode register C1 (TMC1: $014):
Timer mode register C1 (TMC1) is a 4-bit write-only register, used to select free-running/reload timer
operation, the input clock, and the prescaler division ratio as shown in figure 48.
Timer mode register C1 (TMC1) is reset to $0 by an MCU reset.
A modification of timer mode register C1 (TMC1) becomes effective after execution of two instructions
following the timer mode register C1 (TMC1) write instruction. The program must provide for timer C
initialization by writing to timer write register C (TWCL, TWCU) to be executed after the post-
modification mode has become effective.
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