EM78808
8-bit Micro-controller
SCK
SDO
SDI
IO (PORT60)
O (PORT61)
Master: output pin, Slave: input pin. This pin shared with PORT60.
Output pin for serial data transferring. This pin shared with PORT61.
Input pin for receiving data. This pin shared with PORT62.
I
(PORT62)
Comparator
CMP1
CMP2
CMP3
I
I
I
(PORT63)
(PORT64)
(PORT65)
Comparator input pins. Shared with PORT63, PORT64 and
PORT65.
CURRENT
DA
DAOUT
O (PORT66)
Current DA output pin. It can be a control signal for sound
generating.
Shared with PORT66.
IO
P55 ~P57
P60 ~P67
I/O
I/O
PORT 5 can be INPUT or OUTPUT port each bit.
PORT 6 can be INPUT or OUTPUT port each bit.
Internal pull high.
P70 ~ P77
I/O
PORT 7 can be INPUT or OUTPUT port each bit.
Internal Pull high function.
Auto key scan function.
Interrupt function.
P80 ~ P87
P90 ~ P97
PB0 ~ PB7
PC0 ~ PC7
INT0
I/O
PORT 8 can be INPUT or OUTPUT port each bit.
Shared with LCD Segment signal.
PORT 9 can be INPUT or OUTPUT port each bit.
Shared with LCD Segment signal.
PORT B can be INPUT or OUTPUT port each bit.
Shared with LCD Segment signal.
PORT C can be INPUT or OUTPUT port each bit.
Shared with LCD Segment signal.
I/O
I/O
I/O
PORT70..73
Interrupt sources which has the same interrupt flag. Any pin from
PORT70 to PORT73 has a falling edge signal, it will generate a
interruption.
INT1
INT2
PORT74..76
PORT77
Interrupt sources which has the same interrupt flag. Any pin from
PORT74 to PORT76 has a falling edge signal, it will generate a
interruption.
Interrupt source. Once PORT77 has a falling edge or rising edge
signal (controlled by CONT register), it will generate a interruption.
Low reset
/RESET
X2OUT
CA-1
I
O
O
System clock output.
CA-1 is used as address line to select low-order data (8 bits, through
CD0~CD7) or high-order data (5 bits, through CD0~CD4)
ERS=1 => CA-1 NO USE
ERS=0 => CA-1=0 HIGH ORDER DATA
CA-1=1 LOW ORDER DATA
ERS
I
Input pin used to select the external ROM data bus through bus
CD0~D12 or CD0~CD7 only.
CD0~CD7.
HIGH/LOW = CD0~CD12 /
CA0~CA14
O
Program code address bus. CA0~CA14 are address output pins for
external programming ROM access.
CD0~CD12
IRSEL
I
O
Data access in terms of CA0 ~ CA12 addressing.
IRSEL is an output pin used to select an external EVEN/ODD
ROM.
INSEND
/HOLD
O
I
Used to indicate the instruction completion and ready for next
instruction.
Microcontroller hold request.
______________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
8/1/2004 (V3.1)
60
ELAN [ ELAN MICROELECTRONICS CORP ]
