HD6433713 datasheet(150/324 Pages) RENESAS

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Table 8-2 shows the register configuration of timer A.

Table 8-2 Timer A Registers

Name

Abbrev.

R/W

Initial Value

Address

Timer mode register A

TMA

R/W

H'F0

H'FFC0

Timer counter A

TCA

H'00

H'FFC1

8.2.2 Register Descriptions

Timer mode register A (TMA)

TMA is an 8-bit read/write register for selecting the prescaler and input clock.

Upon reset, TMA is initialized to H'F0.

Bits 7 to 4: Reserved bits

Bits 7 to 4 are reserved; they always read 1, and cannot be modified.

Bit 3: Prescaler select (TMA3)

Bit 3 selects either prescaler S or prescaler W as the clock input source for timer A.

Bit 3

TMA3

Description

Prescaler S (PSS) is clock input source for timer A.

(initial value)

Prescaler W (PSW) is clock input source for timer A.

Bit

Initial value

Read/Write

—

TMA3

R/W

TMA0

R/W

TMA2

R/W

TMA1

R/W

139

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