Table of Contents
Advertisement
4. IOCA (Prescaler Counter Register)
• IOCA register is readable.
• The value of IOCA is equal to the contents of Prescaler counter.
• Down counter.
5. IOCB (Pull-down Control Register)
7
/PD7
• Bit 0 (/PD0) Control bit is used to enable the pull-down of P50 pin.
0: Enable internal pull-down
1: Disable internal pull-down
• Bit 1 (/PD1) Control bit is used to enable the pull-down of P51 pin.
• Bit 2 (/PD2) Control bit is used to enable the pull-down of P52 pin.
• Bit 3
Not used.
• Bit 4 (/PD4) Control bit is used to enable the pull-down of P60 pin.
• Bit 5 (/PD5) Control bit is used to enable the pull-down of P61 pin.
• Bit 6 (/PD6) Control bit is used to enable the pull-down of P62 pin.
• Bit 7 (/PD7) Control bit is used to enable the pull-down of P63 pin.
• IOCB Register is both readable and writable.
6. IOCC (Open-drain Control Register)
7
OD7
• Bit 0 (OD0) Control bit is used to enable the open-drain of P60 pin.
0: Disable open-drain output
1: Enable open-drain output
• Bit 1 (OD1) Control bit is used to enable the open-drain of P61 pin.
• Bit 2 (OD2) Control bit is used to enable the open-drain of P62 pin.
• Bit 3 (OD3) Control bit is used to enable the open-drain of P63 pin.
• Bit 4 (OD4) Control bit is used to enable the open-drain of P64 pin.
• Bit 5 (OD5) Control bit is used to enable the open-drain of P65 pin.
• Bit 6 (OD6) Control bit is used to enable the open-drain of P66 pin.
• Bit 7 (OD7) Control bit is used to enable the open-drain of P67 pin.
• IOCC Register is both readable and writable.
This specification is subject to change without prior notice.
6
5
/PD6
/PD5
6
5
OD6
OD5
4
3
/PD4
-
4
3
OD4
OD3
11
EM78P156EL
OTP ROM
2
1
/PD2
/PD1
2
1
OD2
OD1
0
/PD0
0
OD0
2002/04/19
Advertisement
Table of Contents
