MC68307V Datasheet, PDF (18/34 Pages) Motorola, Inc – Technical Summary Integrated Multiple-Bus Processor

Table 11. Signal index
Mnemonic
Description
D15-D0 Data bus
A23-A8 Address bus out
AD7-AD0/A7-A0 Multiplexed 8051 address/data/Address bus out
AS
Address strobe
UDS
Upper data strobe
LDS
Lower data strobe
R/W
Read/write
DTACK Data acknowledge
HALT
System halt
RESET System reset
TRST/RSTIN Power-on reset
CS0
Chip select 0 (ROM)
CS1
Chip select 1 (RAM)
CS2/CS2A Chip select 2 (peripherals)
CS3
Chip select 3 (8051)
ALE
Address latch enable (8051)
RD
8051-bus read
WR
8051-bus write
EXTAL
External clock/crystal in
XTAL
External crystal
CLKOUT Clock to system
BUSW
Initial data bus width for CS0
CS2B/PA0 Chip select 2B / I/O port A bit 0
CS2C/PA1 Chip select 2C / I/O port A bit 1
CS2D/PA2 Chip select 2D / I/O port A bit 2
TOUT1/PA3 Timer 1 output / I/O port A bit 3
TOUT2/PA4 Timer 2 output / I/O port A bit 4
BR/PA5 Bus request input / I/O port A bit 5
BG/PA6 Bus grant output / I/O port A bit 6
BGACK/PA7 Bus grant acknowledge output / I/O port A bit 7
IRQ7
Interrupt level 7
SCL/PB0 Serial M-bus clock / port B bit 0
SDA/PB1 Serial M-bus data / port B bit 1
TxD/PB2 UART transmit data / port B bit 2
RxD/PB3 UART receive data / port B bit 3
RTS/PB4 Request-to-send / port B bit 4
CTS/PB5 Clear-to-send / port B bit 5
TIN1/PB6 Timer 1 input / port B bit 6
TIN2/PB7 Timer 2 input / port B bit 7
INT1/PB8 Interrupt in 1 / port B bit 8
INT2/PB9 Interrupt in 2 / port B bit 9
INT3/PB10 Interrupt in 3 / port B bit 10
INT4/PB11 Interrupt in 4 / port B bit 11
INT5/PB12 Interrupt in 5 / port B bit 12
INT6/PB13 Interrupt in 6 / port B bit 13
INT7/PB14 Interrupt In 7 / port B bit 14
INT8/PB15 Interrupt in 8 / port B bit 15
Configuration
Bidirectional
Output
Bidirectional
Output
Output
Output
Output
Bidirectional
Bidirectional
Bidirectional
Input
Output
Output
Output
Output
Output
Output
Output
Input
Output
Output
Input
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Input
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
Bidirectional
18
MC68307 TECHNICAL INFORMATION
MOTOROLA