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EM78P157NAM

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P157N

8-Bit Microcontroller with OTP ROM

4.2.2 Control (CONT ) Register

Bit 7

-

Bit 6

/INT

Bit 5

TS

Bit 4

TE

Bit 3

PAB

Bit 2

PSR2

Bit 1

PSR1

Bit 0

PSR0

CONT register is both readable and writable

Bit 0 ~ Bit 2 (PSR0 ~ PSR2): TCC/WDT prescaler bits

PSR2

0

0

0

0

1

1

1

1

PSR1

0

0

1

1

0

0

1

1

PSR0

0

1

0

1

0

1

0

1

TCC Rate

1:2

1:4

1:8

1:16

1:32

1:64

1:128

1:256

WDT Rate

1:1

1:2

1:4

1:8

1:16

1:32

1:64

1:128

Bit 3 (PAB): Prescaler assignment bit

0: TCC

1: WDT

Bit 4 (TE):

TCC signal edge

0: increment if the transition from low to high takes place on TCC pin

1: increment if the transition from high to low takes place on TCC pin

Bit 5 (TS):

TCC signal source

0: internal instruction cycle clock

1: transition on TCC pin

Bit 6 (/INT): Interrupt enable flag

0: masked by DISI or hardware interrupt

1: enabled by ENI/RETI instructions

Bit 7:

Not used

4.2.3 I/O Port Control (IOC5 ~ IOC6) Registers

„ 0: defines the relative I/O pin as output

1: put the relative I/O pin into high impedance

„ Only the lower 4 bits of IOC5 can be defined.

„ IOC5 and IOC6 registers are both readable and writable

4.2.4 Prescaler Counter (IOCA ) Register

„ IOCA register is readable

„ The value of IOCA is equal to the contents of Prescaler counter

„ Down counter

Product Specification (V1.0) 09.22.2005

•9

(This specification is subject to change without further notice)

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