EM78F651NAMSSLASHNAMJ datasheet(18/58 Pages) EMC

18 / 58 page

EM78F651N

8-Bit Microcontroller

•

Product Specification (V1.1) 10.20.2006

(This specification is subject to change without further notice)

6.2.3 IOC5 ~ IOC7 (I/O Port Control Register)

A value of "1" sets the relative I/O pin into high impedance, while "0" defines the

relative I/O pin as output.

Only Bits 4, 5 of R5 are available (EM78F651NA)

Only Bits 0, 3, 4, 5 of IOC5 can be defined (EM78F651NB)

Only the lower 6 bits of IOC5 can be defined (EM78F651NC)

Only Bit 0 of IOC7 is available, when P7.0 is set as output, a pull-high resistor must

be tied to Vdd, since this is an internal open-drain circuit.

IOC5 and IOC7 registers are both readable and writable.

6.2.4 IOCA (WDT Control Register)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

WDTE

EIS

PSWE

PSW2

PSW1

PSW0

Bit 7 (WDTE) Control bit used to enable the Watchdog timer

0 : Disable WDT

1 : Enable WDT

WDTE is both readable and writable.

Bit 6 (EIS):

Control bit used to define the function of P60 (/INT) pin

0 : P60, bidirectional I/O pin

1 : /INT, external interrupt pin. In this case, the I/O control bit of P60

(Bit 0 of IOC6) must be set to "1".

When EIS is "0", the path of /INT is masked. When EIS is "1", the

status of /INT pin can also be read by way of reading Port 6 (R6).

Refer to Fig 6-5 (a).

EIS is both readable and writable.

Bits 5~4:

Not used, set to “0” at all time

Bit 3 (PSWE): Prescaler enable bit for WDT

0 : prescaler disable bit, WDT rate is 1:1

1 : prescaler enable bit, WDT rate is set as Bit 0~Bit 2

Bit 2 (PSW2) ~ Bit 0 (PSW0): WDT prescaler bits

PSW2

PSW1

PSW0

WDT Rate

1:2

1:4

1:8

1:16

1:32

1:64

1:128

1:256

EM78F651NAMS/NAMJ Datenblatt(PDF) 18 Page - ELAN Microelectronics Corp

EM78F651NAMS/NAMJ Datenblatt(HTML) 18 Page - ELAN Microelectronics Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

Datenblatt Download

Link URL