Motorola M68MPB916R1 User Manual page 37

Table 4-7. Logic Analyzer Connector J13 Pin Assignments (continued)
Pin
7
8
9
10
11
12
13
14
M68MPB16R1UM/D
Freescale Semiconductor, Inc.
Mnemonic
DS DATA STROBE – Active-low output signal. During a
read cycle, indicates that an external device should
place valid data on the data bus. During a write
cycle, indicates that valid data is on the data bus.
BR / BUS REQUEST – Active-low input signal that
indicates an external device requires bus mastership.
CHIP SELECT 0 – Output signal that selects
CS0 peripheral or memory devices at programmed
addresses.
BG / BUS GRANT – Active-low output signal that indicates
the MCU has relinquished the bus.
CSM INTERNAL MODULE CHIP SELECT – Active-low
output signal that selects an external emulation
device at internally-mapped address.
CSBOOT BOOT CHIP SELECT – An active-low output chip
select for external boot startup ROM
CLKOUT SYSTEM CLOCK OUTPUT – MCU internal clock
output signal.
A23 / ADDRESS BUS BIT 23 – One bit of the 24-bit
address bus.
CS10 CHIP SELECT 10 – Output signal that selects
peripheral or memory devices at programmed
addresses.
ECLK
EXTERNAL CLOCK – M6800 bus clock output.
A22 / ADDRESS BUS BIT 22 – One bit of the 24-bit
address bus.
CS9 CHIP SELECT 9 – Output signal that selects
peripheral or memory devices at programmed
addresses.
A21 / ADDRESS BUS BIT 21 – One bit of the 24-bit
address bus.
CS8 CHIP SELECT 8 – Output signal that selects
peripheral or memory devices at programmed
addresses.
For More Information On This Product,
Go to: www.freescale.com
MEVB SUPPORT INFORMATION
Signal
4-7 7