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MC68302FC16 Datasheet(PDF) 100 Page - Motorola, Inc

Part # MC68302FC16
Description  Integrated Multiprotocol Processor User?셲 Manual
Download  480 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC68302FC16 Datasheet(HTML) 100 Page - Motorola, Inc

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System Integration Block (SIB)
3-50
MC68302 USER’S MANUAL
MOTOROLA
EXTAL can also accept a CMOS-level clock input. The crystal output (XTAL) connects the
internal crystal generator output to an external crystal. If an external clock is used, XTAL
should be left unconnected. The CLKO pin, which drives the high-speed system clock, may
be used to synchronize other peripherals to the IMP system clock.
3.8 SYSTEM CONTROL
The IMP system control consists of a System Control Register (SCR) that configures the fol-
lowing functions:
• System Status and Control Logic
•AS Control During Read-Modify-Write-Cycles
• Disable CPU (M68000) Logic
• Bus Arbitration Logic with Low-Interrupt Latency Support
• Hardware Watchdog
• Low-Power (Standby) Modes
• Freeze Control
3.8.1 System Control Register (SCR)
The SCR is a 32-bit register that consists of system status and control bits, a bus arbiter con-
trol bit, hardware watchdog control bits, low-power control bits, and freeze select bits. Refer
to Figure 3-11, Table 3-7, and to the following paragraphs for a description of each bit in this
register. The SCR is a memory-mapped read-write register. The address of this register is
fixed at $0F4 in supervisor data space (FC = 5).
Figure 3-11. System Control Register
31
30
29
28
27
26
25
24
0
0
0
0
IPA
HWT
WPV
ADC
23
22
21
20
19
18
17
16
0
ERRE
VGE
WPVE
RMCST
EMWS
ADCE
BCLM
15
14
13
12
11
10
8
FRZW
FRZ2
FRZ1
SAM
HWDEN
HWDCN2–HWDCN0
76
5
4
0
LPREC
LPP16
LPEN
LOW-POWER CLOCK DIVIDER


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