HD6417021 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

Номер в каталоге

Компоненты Описание

производитель

HD6417021

SuperH™ RISC engine

Hitachi -> Renesas Electronics 

1.3.2

Pin Functions

Table 1.3 describes the pin functions.

Table 1.3 Pin Functions

Type

Symbol Pin No. I/O Name and Function

Power

VCC

VSS

13, 38, I

63, 73,

80, 88

4, 15, 24, I

32, 41,

50, 59,

70, 81,

82, 92

Power: Connected to the power supply. Connect all

VCC pins to the system power supply . The chip will not

operate if any VCC pin is left unconnected.

Ground: Connected to ground. Connect all VSS pins to

the system ground. The chip will not operate if any VSS

pin is left unconnected.

VPP

76*

I

RES pin in the MCU mode. Apply +12.5V when

programming the PROM in the SH7021 (PROM

version).

Clock

EXTAL 71

I

Crystal/external clock: Connected to a crystal resonator

or external clock input having the same frequency as

the system clock (CK).

XTAL

72

I

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.

CK

69

O System clock: Supplies the system clock (CK) to

peripheral devices.

System RES

76

control

I

Reset: Low input causes a power-on reset if NMI is

high, or a manual reset if NMI is low.

WDTOVF 75

O Watchdog timer overflow: Overflow output signal from

the watchdog timer.

BREQ 60

I

Bus request: Driven low by an external device to

request the bus ownership.

BACK

58

O 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.

Note: Pin 76 is RES in the SH7020, SH7021 (Masked ROM version) and Vpp in the SH7021

(PROM version).

HITACHI 9

Share Link: