HD4046212RFS datasheet(79/157 Pages) RENESAS

79 / 157 page

HD404629R Series

 Port mode register C (PMRC: $025)

 Detection edge select register 2 (ESR2: $027)

• Timer mode register D1 (TMD1: $010): Four-bit write-only register that selects the free-running/reload

timer function, input clock source, and the prescaler division ratio as shown in figure 63. It is reset to

$0 by MCU reset.

Writing to this register is valid from the second instruction execution cycle after the execution of the

previous timer mode register D1 (TMD1: $010) write instruction. Setting timer D’s initialization by

writing to timer write register D (TWDL: $011, TWDU: $012) must be done after a mode change

becomes valid.

When selecting the input capture timer operation, select the internal clock as the input clock source.

Bit

Initial value

Read/Write

Bit name

TMD13

TMD12

TMD10

TMD11

Timer mode register D1 (TMD1: $010)

2048tcyc

512tcyc

128tcyc

32tcyc

8tcyc

4tcyc

2tcyc

TMD12

TMD10

TMD11

Input clock period and

input clock source

R20/EVND

(external event input)

TMD13

Free-running/reload timer selection

Free-running timer

Reload timer

Figure 63 Timer Mode Register D1 (TMD1)

• Timer mode register D2 (TMD2: $015): Four-bit read/write register that selects the timer D output

mode and input capture operation as shown in figure 64. It is reset to $0 by MCU reset.

• Timer write register D (TWDL: $011, TWDU: $012): Write-only register consisting of the lower digit

(TWDL) and the upper digit (TWDU). The operation of timer write register D is basically the same as

that of timer write register B (TWBL: $00A, TWBU: $00B).

• Timer read register D (TRDL: $011, TRDU: $012): Read-only register consisting of the lower digit

(TRDL) and the upper digit (TRDU). The operation of timer read register D is basically the same as

that of timer read register B (TRBL: $00A, TRBU: $00B).

When the input capture timer operation is selected and if the count of timer D is read after a trigger is

input, either the lower or upper digit can be read first.

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