MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 269
MC68000
Manufacturer Part Number
MC68000
Description
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68000.pdf
(480 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68000-10/BZAJC
Manufacturer:
MOT
Quantity:
26
Company:
Part Number:
MC68000-8BXAJ
Manufacturer:
MOT
Quantity:
9
Company:
Part Number:
MC680008FN8
Manufacturer:
FREESCALE
Quantity:
8 831
Company:
Part Number:
MC68000FN10
Manufacturer:
MOT
Quantity:
5 510
Part Number:
MC68000FN10
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Company:
Part Number:
MC68000FN12
Manufacturer:
MOT
Quantity:
5 510
Part Number:
MC68000L8
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Part Number:
MC68000P10
Manufacturer:
MOT
Quantity:
20 000
- Current page: 269 of 480
- Download datasheet (2Mb)
5.4 SYSTEM CONTROL
The system control pins are shown in Figure 5-3.
RESET
MOTOROLA
and system integration block. All M68000 bus timings are referenced to the CLKO signal.
CLKO supports both CMOS and TTL output levels. The output drive capability of the
CLKO signal is programmable in the CKCR register (see 3.9 Clock Control Register) to
one-third, two-thirds, or full strength, or this output can be disabled.
This bidirectional, open-drain signal, acting as an input and asserted along with the HALT
pin, starts an initialization sequence called a total system reset that resets the entire
MC68302. RESET and HALT should remain asserted for at least 100 ms at power-on re-
set, and at least 10 clocks otherwise. The on-chip system RAM is not initialized during re-
set except for several locations initialized by the CP.
An internally generated reset, from the M68000 RESET instruction, causes the RESET
line to become an output for 124 clocks. In this case, the M68000 core is not reset; how-
ever, the communication processor is fully reset, and the system integration block is al-
most fully reset (refer to Table 2-6 and Table 2-9 for a list of the unaffected registers). The
user may also use the RESET output signal in this case to reset all external devices.
During total system reset, the address, data, and bus control pins are all three-stated, ex-
cept for CS3–CS0, which are high, and IAC, which is low. The BG pin output is the same
as that on the BR input. The general-purpose I/O pins are configured as inputs, except for
WDOG, which is an open-drain output. The NMSI1 pins are all inputs, except for RTS1
and TXD1, which output a high value. RTS3, NC1, and NC3 are also high. CLKO is active
and BRG1 is CLO/3.
The RESET pin should not be asserted externally without also
asserting the HALT pin. To reset just the internal MC68302 pe-
ripherals, the RESET instruction may be used. If the RESET in-
struction is to be used, then the pull-up resistor on RESET
should not be greater than 1.2 k ohms.
Figure 5-3. System Control Pins
MC68302 USER’S MANUAL
MC68302
NOTE
BUSW
DISCPU
FRZ
RESET
HALT
BERR
Signal Description
5-5
Related parts for MC68000
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Motorola, Inc [VOLTAGE REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
6367254 MOTOROLA SC (XSTRS/R F)
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
MC1494LMotorola, Inc [MONOLITHIC FOUR-QUADRANT MULTIPLIER]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC1466LMotorola, Inc [PRECISION WIDE RANGE VOLTAGE AND CURRENT REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC145532DWMotorola, Inc [ADPCM Transcoder]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Silicon Controlled Rectifiers
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF Power Field Effect Transistors N-Channel Enhancement-Mode Lateral MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTORS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
LATERAL N-CHANNEL BROADBAND RF POWER MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF LOW POWER TRANSISTOR NPN SILICON
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
PLASTIC SURFACE MOUNT ZENER DIODES 1.5 WATTS 3.3-68 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
OVERVOLTAGE TRANSIENT SUPPRESSOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET 15 AMPERES 60 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET LOGIC LEVEL 19 AMPERES 30 VOLTS RDS(on) = 0.099 OHM
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet: