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IC80C32

CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

Integrated Circuit Solution Inc 

IC80C52

IC80C32

Mode 1:

Mode 1 is the same as Mode 0, except that the Timer register

is run with all 16 bits. The clock is applied to the combined

high and low timer registers (TL1/TH1). As clock pulses are

received, the timer counts up: 0000H, 0001H, 0002H, etc.

An overflow occurs on the FFFFH-to-0000H overflow flag.

The timer continues to count. The overflow flag is the TF1 bit

in TCON that is read or written by software (see Figure 9).

Mode 2:

Mode 2 configures the Timer register as an 8-bit Counter

(TL1) with automatic reload, as shown in Figure 10. Overflow

from TL1 not only sets TF1, but also reloads TL1 with the

contents of TH1, which is preset by software. The reload

leaves the TH1 unchanged. Mode 2 operation is the same

for Timer/Counter 0.

Mode 3:

Timer 1 in Mode 3 simply holds its count. The effect is the

same as setting TR1 = 0. Timer 0 in Mode 3 establishes TL0

and TH0 as two separate counters. The logic for Mode 3 on

Timer 0 is shown in Figure 11. TL0 uses the Timer 0 control

bits: C/T, GATE, TR0, INT0, and TF0. TH0 is locked into a

timer function (counting machine cycles) and over the use of

TR1 and TF1 from Timer 1. Thus, TH0 now controls the

Timer 1 interrupt.

Mode 3 is for applications requiring an extra 8-bit timer or

counter. With Timer 0 in Mode 3, the IC80C52 can appear to

have four Timer/Counters. When Timer 0 is in Mode 3, Timer

1 can be turned on and off by switching it out of and into its

own Mode 3. In this case, Timer 1 can still be used by the

serial port as a baud rate generator or in any application not

requiring an interrupt.

TIMER

CLOCK

TL1

(8 BITS)

TH1

(8 BITS)

TF1

OVERFLOW

FLAG

Figure 9. Timer/Counter 1 Mode 1: 16-Bits Counter

OSC

DIVIDE 12

T1 PIN

GATE

INT0 PIN

C/T = 0

C/T = 1

TR1

TL1

(8 BITS)

CONTROL

TF1

RELOAD

TH1

(8 BITS)

Figure 10. Timer/Counter 1 Mode 2: 8-Bit Auto-Reload

INTERRUPT

16

Integrated Circuit Solution Inc.

MC002-0B

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