UPSD3213B-40T6(2009) データシートの表示（PDF） - STMicroelectronics

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UPSD3213B-40T6
(Rev.:2009)

Flash programmable system devices with 8032 MCU and USB and programmable logic

STMicroelectronics 

Timer/counters (Timer 0, Timer 1 and Timer 2)

UPSD3212A, UPSD3212C, UPSD3212CV

11.1.3

Table 39. Description of the TMOD bits

Bit Symbol Timer

Function

7

Gate

Gating control when set. Timer/Counter 1 is enabled only while INT1 pin

is High and TR1 control pin is set. When cleared, Timer 1 is enabled

whenever TR1 control bit is set

6

C/T

Timer or Counter selector, cleared for timer operation (input from internal

system clock); set for counter operation (input from T1 input pin)

5

M1 Timer1 (M1,M0)=(0,0): 13-bit Timer/Counter, TH1, with TL1 as 5-bit prescaler

(M1,M0)=(0,1): 16-bit Timer/Counter. TH1 and TL1 are cascaded. There

is no prescaler.

4

M0

(M1,M0)=(1,0): 8-bit auto-reload Timer/Counter. TH1 holds a value which

is to be reloaded into TL1 each time it overflows

(M1,M0)=(1,1): Timer/Counter 1 stopped

3

Gate

Gating control when set. Timer/Counter 0 is enabled only while INT0 pin

is High and TR0 control pin is set. When cleared, Timer 0 is enabled

whenever TR0 control bit is set

2

C/T

Timer or Counter selector, cleared for timer operation (input from internal

system clock); set for counter operation (input from T0 input pin)

1

M1

(M1,M0)=(0,0): 13-bit Timer/Counter, TH0, with TL0 as 5-bit prescaler

Timer0 (M1,M0)=(0,1): 16-bit Timer/Counter. TH0 and TL0 are cascaded. There

is no prescaler.

0

M0

(M1,M0)=(1,0): 8-bit auto-reload Timer/Counter. TH0 holds a value which

is to be reloaded into TL0 each time it overflows

(M1,M0)=(1,1): TL0 is an 8-bit Timer/Counter controlled by the standard

TImer 0 control bits. TH0 is an 8-bit timer only controlled by Timer 1

control bits

Mode 2

Mode 2 configures the Timer register as an 8-bit Counter (TL1) with automatic reload, as

shown in Figure 22. Overflow from TL1 not only sets TF1, but also reloads TL1 with the

contents of TH1, which is preset by software. The reload leaves TH1 unchanged. Mode 2

operation is the same for Timer/Counter 0.

Figure 22. Timer/counter mode 2: 8-bit Auto-reload

fOSC

÷ 12

T1 pin

TR1

Gate

INT1 pin

C/T = 0

C/T = 1

Control

TL1

(8 bits)

TH1

(8 bits)

TF1

Interrupt

AI06623

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