mcf5271 Freescale Semiconductor, Inc, mcf5271 Datasheet - Page 17

• Manufacturer Part Number: mcf5271
• Description: Mcf5271 Integrated Microprocessor
• Manufacturer: Freescale Semiconductor, Inc

5.1.1
Freescale Semiconductor
•
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RCON
D16
D20, D19
D21
CLKMOD1,
CLKMOD0
— Partial drive strength (Default)
— Full drive strength
Clock mode:
— Normal PLL with external crystal
— Normal PLL with external clock
— 1:1 PLL Mode
— External oscillator mode (no PLL)
Chip Select Configuration:
— PADDR[7:5] configured as chip select(s) and/or address line(s)
– PADDR[7:5] configured as A23-A21 (default)
– PADDR configured as CS6, PADDR[6:5] as A22-A21
– PADDR[7:6] configured as CS[6:5], PADDR5 as A21
– PADDR[7:5] configured as CS[6:4]
Chip Configuration Pins
Pin
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Chip configuration
enable
Select chip
operating mode
Select external boot
device data port size
Select output pad
drive strength
Select clock mode
Chip Configuration
Function
Table 3. Configuration Pin Descriptions
00 External clock mode (no
1 Disabled
0 Enabled
1 Master
0 Reserved
00,11 External (32-bit)
10 External (8-bit)
01 External (16-bit)
1 Full
0 Partial
01 1:1 PLL mode
10 Normal PLL with
11 Normal PLL with crystal
PLL)
external clock reference
clock reference
Pin State/Meaning
Active low: if asserted, then all
configuration pins must be driven
appropriately for desired operation
Value read defaults to 32-bit
VDDPLL must be supplied if a PLL
mode is selected
Comments
Modes of Operation
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