P87LPC778FDH datasheet(49/79 Pages) PHILIPS

49 / 79 page

Philips Semiconductors

P87LPC778

CMOS single-chip 8-bit microcontroller

Product data

Rev. 01 — 31 March 2004

49 of 79

9397 750 12378

IT1

Interrupt 1 Type control bit. Set/cleared by software to specify

falling edge/low level triggered external interrupts.

IE0

Interrupt 0 Edge ﬂag. Set by hardware when external interrupt 0

edge is detected. Cleared by hardware when the interrupt is

processed, or by software.

IT0

Interrupt 0 Type control bit. Set/cleared by software to specify

falling edge/low level triggered external interrupts.

Table 47:

TCON - Timer/counter control register (address 88H) bit description

Bit

Symbol

Description

Fig 19. Timer/counter 0 or 1 in Mode 0 (13-bit counter).

002aaa637

Osc/6

or Osc/12

Tn pin

TRn

Gate

INTn pin

C/T = 0

C/T = 1

TLn

(5-bits)

THn

(8-bits)

TFn

control

TnOE

Tn pin

toggle

overflow

interrupt

Fig 20. Timer/counter 0 or 1 in Mode 1 (16-bit counter).

002aaa638

Osc/6

or Osc/12

Tn pin

TRn

Gate

INTn pin

C/T = 0

C/T = 1

TLn

(8-bits)

THn

(8-bits)

TFn

control

TnOE

Tn pin

toggle

overflow

interrupt

Fig 21. Timer/counter 0 or 1 in Mode 2 (8-bit auto-reload).

002aaa639

Osc/6

or Osc/12

Tn pin

TRn

Gate

INTn pin

C/T = 0

C/T = 1

TLn

(8-bits)

THn

(8-bits)

TFn

control

Tine

Tn pin

toggle

overflow

interrupt

reload

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