Service manual

FO-4700U
FO-47UC
P40/XCOUT,
P41/XCIN
P42/INT0
P43/INT1
P44/RXD,
P45/TXD,
P46/SCLK1,
P47/SRDY1,
VCC, VSS Power supply input VCC 2.7V~5.5V, VSS 0V input.
CMPVCC Analog comparator Power supply input terminal of analog comparator.
power supply input
CNVSS CNVss It is the terminal which controls the movement mode of the chip.
Connect this terminal to VSS. When it is connected to VCC, the internal ROM
is prohibited, and it accesses the external memory.
ADVREF Standard voltage input Standard voltage input terminal of A–D converter.
AVSS Analog power supply Power supply input terminal of A–D converter, D-A converter and analog
input comparator. Connect this terminal to VSS.
CMPOUT Analog comparator Output terminal of analog comparator.
output
RESET Reset input Reset input terminal of active “ L ”.
XIN Clock input Input/output terminal of clock occurrence circuit.
Ceramic oscillator or crystal oscillator is connected between XIN and XOUT.
When using the external clock, connect clock oscillator to XIN and XOUT is open.
8bit input/output port.
Input and output can be specified in the bit unit by program.
Pull up control is possible.
It functions as address bus and date bus when the external memory is connected.
Output form is SMOS 3 state in the CMOS input level.
Port P2 is possible to switch CMOS/TTL input level.
Input/output port P3 8bit input/output port.
Input/output can be specifiled in the bit unit by
program.
It functions as a control bus when the external
memory is connected.
Output form is SMOS 3 state in the CMOS input level.
Port P32 is possible to switch CMOS/TTL input level.
input/output port P4 8bit input/output port which has the similar
function of P0.
Output form is CMOS3 state in the CMOS input
level.
Input/output port5 8bit input/output port which has the similar
function of P0.
Output form is CMOS3 state in the CMOS input
level.
P50/TOUT
P51/
SCMP2/
INT2
P52/INT3,
P53/INT4
P54/CNTR0
P55/CNTR1
Clock output function terminal
Terminal name Name Function
8 – 11
Terminal description
Function except for the port
XOUT Clock output
P00 ~ P07 Input/output port P0
P10 ~ P17 Input/output port P1
P20 ~ P27 Input/output port P2
P30/RTP6,
P31/RTP7
P34/CKOUT
P32,P33,
P35 ~ P37
Real time port function
terminal
Sub clock occurrence input/
output terminal
(Oscillator is connected)
Interruption input terminal
Timer X, timer Y function
terminal (INT0,INT1)
Function terminal of serial
I/ 01.
Timer 2, output terminal
Interruption input terminal
Serial I/02 function terminal
Interruption input terminal
Real time port function
terminal (INT4)
Timer X, timer Y function
terminal