HD4046212RFS datasheet(63/157 Pages) RENESAS

tên linh kiện	HD4046212RFS

Giải thích chi tiết về linh kiện	AS Microcomputer Incorporating a DTMF Generator Circuit

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HD404629R Series

Bit

Initial value

Read/Write

Bit name

TMA3

TMA2

TMA0

TMA1

Timer mode register A (TMA: $008)

PSS

PSW

—

Operating mode

Timer A mode

TMA3

TMA1

TMA2

TMA0

Source

prescaler

2048tcyc

1024tcyc

512tcyc

128tcyc

32tcyc

8tcyc

4tcyc

2tcyc

Input clock

frequency

32tWcyc

16tWcyc

8tWcyc

2tWcyc

1/2tWcyc

Time-base

mode

—

X : Don’t care

Note: 1.

tWcyc = 244.14 µs (when a 32.768-kHz crystal oscillator is used)

Timer counter overflow output period (seconds) = input clock period (seconds)

× 256.

If PSW of TCA reset is selected while the LCD is operating, LCD operation halts (power switch

goes off and all SEG and COM pins are grounded).

When an LCD is connected for display, the PSW and TCA reset periods must be set in the

program to the minimum.

The division ratio must not be modified during time-base mode operation, otherwise an overflow

cycle error will occur.

Not used

Reset PSW and TCA

Figure 44 Timer Mode Register A (TMA)

Timer B

Timer B Functions: Timer B has the following functions.

• Free-running/reload timer

• External event counter

• Timer output operation (toggle, 0, and 1 outputs)

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