Micro Crystal

Real Time Clock / Calendar Module

RV-8564

15/40

8.6.1.TIMER CONTROL (address 0Eh…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0Eh

Timer Control

TE

X

X

X

X

X

TD1

TD0

Bit

Symbol

Value

Description

7

TE

0

1)

Timer is disabled

1

Timer is enabled

6 to 2

X

-

Unused

1 to 0

TD[1:0]

00 to 11

1)

Timer source clock frequency selection

2)

Timer Frequency

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

4096 Hz

X

X

X

X

X

X

0

0

64 Hz

X

X

X

X

X

X

0

1

1 Hz

X

X

X

X

X

X

1

0

X

X

X

X

X

X

1

1

saving.

8.6.2.TIMER (address 0Fh…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0Fh

Timer

128

64

32

16

8

4

2

1

Bit

Symbol

Value

Description

7 to 0

Timer

00h to FFh

Countdown value = n

Frequency

Clock

Source

n

Period

Countdown

=

Note:

For accurate read back of the countdown value, the I

least twice the selected timer clock. Since it is not possible to freeze the countdown timer counter during read back,

it is recommended to read the register twice and check for consistent results.