EM78811 Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

ELAN Microelectronics 

EM78811

8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT

CLK(=Fosc/2)

TCC

(16.38KHz CLK)

0

M

1

U

X

1

M

0

U

X

SYNC

2 cycle

Data Bus

TCC(R1)

TE

TS

PAB

TCC overflow interrupt

WDT

WDTE

0M

U

1

X

PAB

8-bit Counter

8-to-1 MUX

PSR0~PSR2

MUX

PAB

I/O Ports

WDT timeout

Fig. 12 Block diagram of TCC WDT

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.13. Port 7 bit6 and bit7 can be open drain.

PCRD

Q PR D

CLK

Q CL

PCWR

PORT

Q PR D

CLK

Q CL

PDWR

0M

1

U

X

PDRD

Fig. 13 The circuit of I/O port and I/O control register

* This specification are subject to be changed without notice.

IOD

10.12.1998 15

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