EM78860 Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM78860

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

EM78860

8-BIT MICRO-CONTROLLER

TCC/WDT Prescaler

There is an 8-bit counter available as prescaler for the TCC or WDT. The prescaler is available for the TCC

only or WDT only at the same time.

• An 8 bit counter is available for TCC or WDT determined by the status of the bit 3 (PAB) of the CONT

register.

• See the prescaler ratio in CONT register.

• Fig. 10 depicts the circuit diagram of TCC/WDT.

• Both TCC and prescaler will be cleared by instructions which write to TCC each time.

• The prescaler will be cleared by the WDTC and SLEP instructions, when assigned to WDT mode.

• The prescaler will not be cleared by SLEP instructions, when assigned to TCC mode.

CLK(=Fosc/2)

Data Bus

TCC

(32K CLK)

0

M

1

U

X

1

M

0

U

X

SYNC

2 cycle

TCC(R1)

TE

TS

PAB

TCC overflow interrupt

WDT

WDTE

0

M

U

1

X

PAB

8-bit Counter

8-to-1 MUX

MUX

PSR0~PSR2

PAB

WDT timeout

Fig. 10 Block diagram of TCC WDT

I/O Ports

The I/O registers, Port 6 ~ Port 9, are bi-directional tri-state I/O ports. Port 7 can be pulled-high internally by

software control. The I/O ports can be defined as “input” or “output” pins by the I/O control registers (IOC6 ~

IOC9 ) under program control. The I/O registers and I/O control registers are both readable and writable. The

I/O interface circuit is shown in Fig.11.

* This specification are subject to be changed without notice.

6.24.1998 13

Share Link: