HD6475328-CP10 Datasheet, PDF (37/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Pin Functions: Table 1-4 gives a concise description of the function of each pin.
Table 1-4 Pin Functions
Pin No.
CP-84,
Type Symbol CG-84 FP-80A I/O Name and Function
Power VCC
16, 55 5, 42 I Power: Connected to the power supply (+5V).
Connect both VCC pins to the system power
supply (+5V). The chip will not operate if either pin
is left unconnected.
VSS
2, 24 12, 29 I Ground: Connected to ground (0V).
41, 42 71
Connect all VSS pins to the system power
64, 83
supply (0V). The chip will not operate if any VSS
pin is left unconnected.
Clock XTAL 1
70
I Crystal: Connected to a crystal oscillator.
The crystal frequency should be double the desired
ø clock frequency.
If an external clock is input at the EXTAL pin, leave
the XTAL pin unconnected.
EXTAL 84
69
I External Crystal: Connected to a crystal
oscillator or external clock. The frequency of the
external clock should be double the desired ø clock
frequency. See section 8.2, “Oscillator Circuit” for
examples of connections to a crystal and external
clock.
ø
3
72
O System Clock: Supplies the ø clock to peripheral
devices.
E
4
73
O Enable Clock: Supplies an E clock to E clock based
peripheral devices.
System BACK 5
74
O Bus Request Acknowledge: Indicates
control
that the bus right has been granted to an external
device. Notifies an external device that issued a
BREQ signal that it now has control of the bus.
16