SH7021 datasheet(30/509 Pages) RENESAS

30 / 509 page

RENESAS 9

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

13, 38,

63, 73,

80, 88

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.

VSS

4, 15, 24,

32, 41,

50, 59,

70, 81,

82, 92

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*

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

programming the PROM in the SH7021 (PROM

version).

Clock

EXTAL

Crystal/external clock: Connected to a crystal resonator

or external clock input having the same frequency as

the system clock (CK).

XTAL

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.

System

control

RES

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

high, or a manual reset if NMI is low.

WDTOVF

Watchdog timer overflow: Overflow output signal from

the watchdog timer.

BREQ

Bus request: Driven low by an external device to

request the bus ownership.

BACK

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).

SH7021 датащи(PDF) 30 Page - Renesas Technology Corp

SH7021 датащи(HTML) 30 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL