UPSD3312D datasheet(98/272 Pages) STMICROELECTRONICS

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Standard 8032 timer/counters

UPSD33xx

98/272

Doc ID 9685 Rev 7

Figure 21.

Timer/Counter Mode 0: 13-bit counter

Figure 22.

Timer/Counter Mode 2: 8-bit Auto-reload

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.

Table 57.

TMOD register bit definition (continued)

Bit

Symbol

R/W

Timer

Definition (T/C is abbreviation for

timer/counter)

AI06622

fOSC

TF1

Interrupt

Gate

TR1

EXTINT1 pin

C1 pin

Control

TL1

(5 bits)

TH1

(8 bits)

C/T = 0

C/T = 1

÷ 12

AI06623

fOSC

TF1

Interrupt

Gate

TR1

EXTINT1 pin

C1 pin

Control

TL1

(8 bits)

TH1

(8 bits)

C/T = 0

C/T = 1

÷ 12

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