HD4043312 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD4043312

4-bit HMCS400-Series microcomputer

Hitachi -> Renesas Electronics 

Timer mode register A (TMA: $008)

Bit

Initial value

Read/Write

Bit name

3

0

W

TMA3

2

0

W

TMA2

1

0

W

TMA1

0

0

W

TMA0

HD404339 Series

Source Input Clock

TMA3 TMA2 TMA1 TMA0 Prescaler Frequency Operating Mode

0

0

0

0 PSS

2048 tcyc Timer A mode

1 PSS

1024 tcyc

1

0 PSS

512 tcyc

1 PSS

128 tcyc

1

0

0 PSS

32 tcyc

1 PSS

8 tcyc

1

0 PSS

4 tcyc

1 PSS

2 tcyc

1

0

0

0 PSW

32tWcyc Time-base

mode

1 PSW

16t Wcyc

1

0 PSW

8t Wcyc

1 PSW

2t Wcyc

1

0

0 PSW

1/2t Wcyc

1 Not used

1 X PSW and TCA reset

X = Don’t care.

Notes: 1. t Wcyc = 244.14 µs (when a 32.768-kHz crystal oscillator is used)

2. Timer counter overflow output period (seconds) = input clock period (seconds) × 256.

3. The division ratio must not be modified during time-base mode operation,

otherwise an overflow cycle error will occur.

Figure 28 Timer Mode Register A (TMA)

39

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