UPSD3313D-40T6 datasheet(72/231 Pages) STMICROELECTRONICS

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Table 40. TMOD: Timer Mode Register (SFR 89h, reset value 00h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

GATE

C/T

M[1:0]

GATE

C/T

M[1:0]

Details

Bit

Symbol

R/W

Timer

Definition (T/C is abbreviation for Timer/Counter)

7GATE

R,W

Timer 1

Gate control.

When GATE = 1, T/C is enabled only while pin EXTINT1

is '1' and the flag TR1 is '1.' When GATE = 0, T/C is

enabled whenever the flag TR1 is '1.'

6C/T

R,W

Counter or Timer function select.

When C/T = 0, function is timer, clocked by internal clock.

C/T = 1, function is counter, clocked by signal sampled on

external pin, C1.

[5:4]

M[1:0]

R,W

Mode Select.

00b = 13-bit T/C. 8 bits in TH1 with TL1 as 5-bit pre-

scaler.

01b = 16-bit T/C. TH1 and TL1 are cascaded. No pre-

scaler.

10b = 8-bit auto-reload T/C. TH1 holds a constant and

loads into TL1 upon overflow.

11b = Timer Counter 1 is stopped.

3GATE

R,W

Timer 0

Gate control.

When GATE = 1, T/C is enabled only while pin EXTINT0

is '1' and the flag TR0 is '1.' When GATE = 0, T/C is

enabled whenever the flag TR0 is '1.'

2C/T

R,W

Counter or Timer function select.

When C/T = 0, function is timer, clocked by internal clock.

C/T = 1, function is counter, clocked by signal sampled on

external pin, C0.

[1:0]

M[1:0]

R,W

Mode Select.

00b = 13-bit T/C. 8 bits in TH0 with TL0 as 5-bit pre-

scaler.

01b = 16-bit T/C. TH0 and TL0 are cascaded. No pre-

scaler.

10b = 8-bit auto-reload T/C. TH0 holds a constant and

loads into TL0 upon overflow.

11b = TL0 is 8-bit T/C controlled by standard Timer 0

control bits. TH0 is a separate 8-bit timer that uses Timer

1 control bits.

UPSD3313D-40T6 Datasheet(PDF) 72 Page - STMicroelectronics

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