ELAN Home Systems EM78P458, EM78P459AK manual IOCB0 Pull-down Control Register, Bit4Bit2 IMS2IMS0

EM78P458/459

OTP ROM

1 = The Vref of the ADC is connected to P53/VREF.

• Bit 6 (CE): Comparator enable bit

0 = Comparator is off (default value);

1 = Comparator is on.

•Bit 5 ( COE ): Set P57 as the output of the comparator

0= the comparator acts as an OP if CE=1.

1= act as a comparator if CE=1.

•Bit4:Bit2 (IMS2:IMS0):

Input Mode Select. ADC configuration definition bit. The following Table describes how to define the characteristic of each pin of R6.

Table 3 Description of AD Configuration Control Bits

IMS2:IMS0		P60	P61	P62	P63	P64	P65	P66	P67
	000	A	D	D	D	D	D	D	D
	001	A	A	D	D	D	D	D	D
	010	A	A	A	D	D	D	D	D
	011	A	A	A	A	D	D	D	D
	100	A	A	A	A	A	D	D	D
	101	A	A	A	A	A	A	D	D
	110	A	A	A	A	A	A	A	D
	111	A	A	A	A	A	A	A	A
• Bit 1: Bit 0 (CKR1: CKR0): The prescaler of oscillator clock rate of ADC
00	= 1: 4 (default value);
01	= 1: 16;
10	= 1: 64;
11	= The oscillator clock source of ADC is from WDT ring oscillator frequency.
	( frequency=256/18ms≒14.2Khz)

6. IOCB0 (Pull-down Control Register)

	7	6	5	4	3	2	1		0
	/PD7	/PD6	/PD5	/PD4	/PD3	/PD2	/PD1		/PD0
	• Bit 0 (/PD0) Control bit is used to enable the pull-down of the P60 pin.
	0: Enable internal pull-down;
	1: Disable internal pull-down.
	• Bit 1 (/PD1) Control bit is used to enable the pull-down of the P61 pin.
	• Bit 2 (/PD2) Control bit is used to enable the pull-down of the P62 pin.
	• Bit 3 (/PD3) Control bit is used to enable the pull-down of the P63 pin.
This specification is subject to change without prior notice.				16				07.01.2003 (V1.3)