EM78P458/459
OTP ROM
011
100
101
110
111
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
D
A
A
A
A
D
D
A
A
A
D
D
D
A
A
D
D
D
D
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
/PD7
6
/PD6
5
/PD5
4
/PD4
3
/PD3
2
/PD2
1
/PD1
0
/PD0
• Bit 7 (/PD7) Control bit is used to enable the pull-down of the P67 pin.
0: Enable internal pull-down;
1: Disable internal pull-down.
• Bit 6 (/PD6) Control bit is used to enable the pull-down of the P66 pin.
• Bit 5 (/PD5) Control bit is used to enable the pull-down of the P65 pin.
• Bit 4 (/PD4) Control bit is used to enable the pull-down of the P64 pin.
• Bit 3 (/PD3) Control bit is used to enable the pull-down of the P63 pin.
• Bit 2 (/PD2) Control bit is used to enable the pull-down of the P62 pin.
• Bit 1 (/PD1) Control bit is used to enable the pull-down of the P61 pin.
• Bit 0 (/PD0) Control bit is used to enable the pull-down of the P60 pin.
• IOCB0 register is both readable and writable.
7. IOCC0 (Open-Drain Control Register)
7
6
5
4
3
2
1
0
/OD7
/OD6
/OD5
/OD4
/OD3
/OD2
/OD1
/OD0
• Bit 7 (OD7) Control bit used to enable the open-drain of the P57 pin.
0: Enable open-drain output
1: Disable open-drain output
• Bit 6 (OD6) Control bit is used to enable the open-drain of the P54 pin.
• Bit 5 (OD5) Control bit is used to enable the open-drain of the P52 pin.
• Bit 4 (OD4) Control bit is used to enable the open-drain of the P51 pin.
• Bit 3 (OD3) Control bit is used to enable the open-drain of the P67 pin.
• Bit 2 (OD2) Control bit is used to enable the open-drain of the P66 pin.
This specification is subject to change without prior notice.
16
06.25.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
