HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 28

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

1.3.2
Table 1.3 describes the pin functions.
Table 1.3
Type
Power
Clock
System
control
Note: Pin 76 is RES in the SH7020, SH7021 (Masked ROM version) and Vpp in the SH7021
(PROM version).
Symbol
V
V
V
EXTAL
XTAL
CK
RES
WDTOVF 75
BREQ
BACK
Pin Functions
Pin Functions
CC
SS
PP
Pin No.
13, 38,
63, 73,
80, 88
4, 15, 24,
32, 41,
50, 59,
70, 81,
82, 92
76*
71
72
69
76
60
58
I/O
I
I
I
I
I
O
I
O
I
O
Name and Function
Power: Connected to the power supply. Connect all
V
operate if any V
Ground: Connected to ground. Connect all V
the system ground. The chip will not operate if any V
pin is left unconnected.
RES pin in the MCU mode. Apply +12.5V when
programming the PROM in the SH7021 (PROM
version).
Crystal/external clock: Connected to a crystal resonator
or external clock input having the same frequency as
the system clock (CK).
Crystal: Connected to a crystal resonator with the same
frequency as the system clock (CK). If an external clock
is input at the EXTAL pin, leave XTAL open.
System clock: Supplies the system clock (CK) to
peripheral devices.
Reset: Low input causes a power-on reset if NMI is
high, or a manual reset if NMI is low.
Watchdog timer overflow: Overflow output signal from
the watchdog timer.
Bus request: Driven low by an external device to
request the bus ownership.
Bus request acknowledge: Indicates that bus ownership
has been granted to an external device. By receiving
the BACK signal, a device that has sent a BREQ signal
can confirm that it has been granted the bus.
CC
pins to the system power supply . The chip will not
CC
pin is left unconnected.
SS
HITACHI 9
pins to
SS