em78p811 ELAN Microelectronics Corp, em78p811 Datasheet - Page 21

• Manufacturer Part Number: em78p811
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

VII.4 I/O Ports
software control. The I/O ports can be defined as "input" or "output" pins by the I/O control registers (IOC6 ~ IOC9 )
under program control. The I/O registers and I/O control registers are both readable and writable. The I/O interface circuit
is shown in Fig.13.
VII
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* This specification is subject to be changed without notice.
(1) Power on reset, or Voltage detector
(2) WDT timeout. (if enabled and in GREEN or NORMAL mode)
Note that only Power on reset, or only Voltage detector in Case(1) is enabled in the system by CODE Option bit. If
Voltage detector is disabled, Power on reset is selected in Case (1). Refer to Fig. 14.
The RESET can be caused by
.
The I/O registers, Port 6 ~ Port 9, are bi-directional tri-state I/O ports. Port 7 can be pulled-high internally by
5 RESET and Wake-up
Fig. 13 The circuit of I/O port and I/O control register
Fig. 14 Block diagram of Reset of controller
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8-bit OTP Micro-controller
EM78P811