Functional Groups; Power Pins; Clocks - Motorola MC68302 User Manual

Table 5-1. Signal Definitions
Functional Group Signals Num.
Clocks XTAL, EXTAL, CLKO 3
System Control RESET, HALT, BERR, BUSW, DISCPU
5
Address Bus A23-A1 23
Data Bus D15-DO 16
Bus Control AS, R/W, UDS/AO, LDS/DS, DTACK 5
Bus Control RMC, IAC, BCLR
3
Bus Arbitration BR,BG,BGACK 3
Interrupt Control IPL2-IPLO, FC2-FCO,AVEC 7
NMSl1/ISDN l/F RXD, TXD, RCLK, TCLK,CD,CTS,RTS 7
NMSl2/PAIO RXD, TXD,RCLK, TCLK,CD,CTS,RTS,SDS2
8
NMSl3/SCP/PAIO RXD, TXD,RCLK, TCLK,CD,CTS,RTS, PA12
8
IDMA/PAIO DREG, DACK, DONE
3
IACK/PBIO IACK7, IACK6, IACK1
3
Timer/PBIO TIN2, TIN1, TOUT2, TOUT1, WDOG 5
PBIO PB11-PB8 4
Chip Select CS3-CSO 4
Testing FRZ (3 Spare) 4
VDD
8
GND 13
5.2 POWER PINS
The IMP has 21 power supply pins. Careful attention has been paid to re-
ducing IMP noise, potential cross-talk, and RF radiation from the output driv-
ers.
Voo
(8) - There are 8 power pins.
GND (13) -There are 13 ground pins.
5.3
CLOCKS
5-2
EXTAL - External Clock/Crystal Input
This input provides two clock generation options. EXTAL may be used
(with XTAL) to connect an external crystal to the on-chip oscillator and
clock generator. If an external clock is used, the clock source should be
connected to EXTAL, and XTAL should be left unconnected. The oscillator
uses an internal frequency equal to the external crystal frequency. The
frequency of EXT AL may range from 8 MHz to 16.67 MHz. When an external
clock is used it must provide a CMOS level at this input.
MC68302 USER'S MANUAL MOTOROLA