UPSD3422_V01 datasheet(99/300 Pages) STMICROELECTRONICS

99 / 300 page

Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422, UPSD3433, UPSD3434, UPSD3454

Standard 8032 timer/counters

99/300

turned on and off by switching it out of and into its own Mode 3, or can still be used by the

serial port as a baud rate generator, or in fact, in any application not requiring an interrupt.

Table 58.

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]

Table 59.

TMOD register bit definition

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.

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422 датащи(PDF) 99 Page - STMicroelectronics

UPSD3422 датащи(HTML) 99 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL