C8051F91X-C8051F90X 查看數據表（PDF） - Silicon Laboratories

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C8051F91X-C8051F90X

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

Silicon Laboratories 

C8051F91x-C8051F90x

25.1.4. Mode 3: Two 8-bit Counter/Timers (Timer 0 Only)

In Mode 3, Timer 0 is configured as two separate 8-bit counter/timers held in TL0 and TH0. The coun-

ter/timer in TL0 is controlled using the Timer 0 control/status bits in TCON and TMOD: TR0, C/T0, GATE0

and TF0. TL0 can use either the system clock or an external input signal as its timebase. The TH0 register

is restricted to a timer function sourced by the system clock or prescaled clock. TH0 is enabled using the

Timer 1 run control bit TR1. TH0 sets the Timer 1 overflow flag TF1 on overflow and thus controls the

Timer 1 interrupt.

Timer 1 is inactive in Mode 3. When Timer 0 is operating in Mode 3, Timer 1 can be operated in Modes 0,

1 or 2, but cannot be clocked by external signals nor set the TF1 flag and generate an interrupt. However,

the Timer 1 overflow can be used to generate baud rates for the SMBus and/or UART, and/or initiate ADC

conversions. While Timer 0 is operating in Mode 3, Timer 1 run control is handled through its mode set-

tings. To run Timer 1 while Timer 0 is in Mode 3, set the Timer 1 Mode as 0, 1, or 2. To disable Timer 1,

configure it for Mode 3.

Pre-scaled Clock

SYSCLK

CKCON

TTTTTTSS

3 3 2 2 1 0CC

MMMMMMA A

HLHL 10

TMOD

GCT TGCT T

A / 11A / 00

T T MM T T MM

E110E010

1

0

0

TR1

1

0

1

T0

Crossbar

TR0

GATE0

TH0

(8 bits)

TL0

(8 bits)

TF1

Interrupt

TR1

TF0

Interrupt

TR0

IE1

IT1

IE0

IT0

INT0

IN0PL XOR

Figure 25.3. T0 Mode 3 Block Diagram

Rev. 1.0

275

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