M41TC8025AMC7F datasheet(18/41 Pages) STMICROELECTRONICS

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Operation

M41TC8025

18/41

DocID022873 Rev 4

The FSEL1 and FSEL0 bits in register 0Dh are for the user to select the output frequency on

the FOUT pin. The frequency options are given in Table 13.

2.6

Fixed-cycle timer interrupt

The fixed-cycle timer interrupt function generates periodic interrupts at any fixed-cycle

programmed between 244.14 μs and 4095 minutes.

When a fixed-cycle timer interrupt is generated, the IRQ pin will be pulled low if enabled (bit

TIE = 1) and the flag bit (TF) will be set to 1 to indicate the interrupt occurrence. After the

IRQ pin is pulled low, it will be automatically released (change to Hi-Z) after time tRTN so that

periodic interrupts can continue to be generated even if the user does not clear the flag bit.

The fixed-cycle timer interrupt function related registers are shown in Table 14.

Note:

All the fixed-cycle interrupt function related register bits are marked in bold.

2.6.1

Related registers

12-bit binary format with a value of 1 (001h) to 4095 (FFFh).

The TE bit in register 0Dh is to start (TE=1) or stop and reset (TE=0) the internal timer. Once

the timer is enabled, it will count from 000h towards the interrupt trigger value. Once the

Table 12. FOUT pin output frequency selection

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0Dh

Extension register

TEST WADA USEL

FSEL1 FSEL0 TSEL1 TSEL0

Table 13. FOUT frequency configuration

FSEL1

FSEL0

FOUT frequency

Comment

32,768 Hz

Default

1,024 Hz

1 Hz

32,768 Hz

Table 14. Fixed-cycle timer interrupt related register bits

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0Bh

Timer counter 0

128

0Ch

Timer counter 1

2048

1024

512

256

0Dh

Extension register TEST

WADA USEL

FSEL1 FSEL0 TSEL1 TSEL0

0Eh

Flag register

VLF

VDET

0Fh

Control register

CSEL1 CSEL0

UIE

TIE

AIE

RESET

Obsolete

Product(s)

- Obsolete

Product(s)

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