LC723781N Datasheet, PDF (12/14 Pages) Sanyo Semicon Device – CMOS IC Electronic tuning system for car audio ETR Microcontrollers

LC723781N/723782N/723783N/723784/723785
Continued from preceding page.
Pin name Pin No.
I/O
RESET
86
I
PH0/ADI0
85
I
PH1/ADI1
84
PH2/ADI2
83
PH3/ADI3
82
PI0/ADI4
81
PI1/ADI5
80
PI2/ADI6
79
PI3/ADI7
78
PJ0
76
O
PJ1
75
PJ2
74
PJ3
73
Pin explanation
System reset pin.
When the CPU is operating or in Halt mode, the system is reset when
this pin is held low for at least one machine cycle. Execution starts
with the PC pointing to location 0. At this time the SNS flip-flop is set.
A low level must be applied for at least 50ms when power is first
applied.
General-purpose input and A/D converter input shared function ports.
The IOS1 instruction is used to switch between the general-purpose
input and the A/D converter input functions.
• When used as general-purpose input ports :
The general-purpose input port function is set up with the IOS1
instruction. (In bit units)
• When used as A/D converter input pins :
The A/D converter input port function is set up with the IOS1
instruction. (In bit units)
The pin whose voltage is to be converted is specified with the IOS1
instruction, and the conversion is started with UCC instruction.
Note : Since input is disabled for ports specified for the ADI function,
executing an input instruction for such a port will always return
a low level.
Input is disabled in Backup mode.
These ports are set up as general-purpose input ports after a power
on reset.
General-purpose output ports (high-voltage output)
Since these are open-drain output circuits, external pull-up resistors
are required.
The internal transistors are turned off (resulting in a high-level output)
in Backup mode and after a power on reset.
Equivalent circuit
PK0/INT0
72
PK1/INT1
71
PK2/INT2
70
PK3/INT3
69
I/O General-purpose I/O and external interrupt shared function ports.
The input formats are Schmitt inputs.
The external interrupt function is enabled when the external interrupt
enable flag is set.
• When used as general-purpose I/O ports :
The mode (input or output) is set in 1-bit units using the IOS1
instruction.
• When used as external interrupt pins :
The external interrupt functions are enabled by setting the
corresponding external interrupt enable flag (INT0EN through
INT3EN). Here, the pins must be set to input mode in advance.
Input is disabled and the pins go to the high-impedance state in
Backup mode.
These ports are set up as general-purpose input ports after a power
on reset.
Continued on next page.
No.8011-12/14