C8051F120DK Silicon Laboratories Inc, C8051F120DK Datasheet - Page 220
![DEVKIT-F120/21/22/23/24/25/26/27](/photos/9/20/92070/c8051f120dk_sml.jpg)
C8051F120DK
Manufacturer Part Number
C8051F120DK
Description
DEVKIT-F120/21/22/23/24/25/26/27
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheet
1.C8051F120DK.pdf
(350 pages)
Specifications of C8051F120DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F12x and C8051F13x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F120
Silicon Family Name
C8051F12x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F120, 121, 122, 123, 124, 125, 126, 127
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1224
Available stocks
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Part Number
Manufacturer
Quantity
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Company:
Part Number:
C8051F120DK
Manufacturer:
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Quantity:
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
Each of these five steps is explained in detail in the following sections. The Port selection, Multiplexed
mode selection, and Mode bits are located in the EMI0CF register shown in SFR Definition 17.2.
17.3. Port Selection and Configuration
The External Memory Interface can appear on Ports 3, 2, 1, and 0 (All Devices) or on Ports 7, 6, 5, and 4
(100-pin TQFP devices only), depending on the state of the PRTSEL bit (EMI0CF.5). If the lower Ports are
selected, the EMIFLE bit (XBR2.1) must be set to a ‘1’ so that the Crossbar will skip over P0.7 (/WR), P0.6
(/RD), and if multiplexed mode is selected P0.5 (ALE). For more information about the configuring the
Crossbar, see
The External Memory Interface claims the associated Port pins for memory operations ONLY during the
execution of an off-chip MOVX instruction. Once the MOVX instruction has completed, control of the Port
pins reverts to the Port latches or to the Crossbar (on Ports 3, 2, 1, and 0). See
Output” on page 235
Port latches should be explicitly configured to ‘park’ the External Memory Interface pins in a dor-
mant state, most commonly by setting them to a logic 1 .
During the execution of the MOVX instruction, the External Memory Interface will explicitly disable the driv-
ers on all Port pins that are acting as Inputs (Data[7:0] during a READ operation, for example). The Output
mode of the Port pins (whether the pin is configured as Open-Drain or Push-Pull) is unaffected by the
External Memory Interface operation, and remains controlled by the PnMDOUT registers. In most cases,
the output modes of all EMIF pins should be configured for push-pull mode. See“Configuring the Output
Modes of the Port Pins” on page 239.
220
Bits7–0: PGSEL[7:0]: XRAM Page Select Bits.
PGSEL7
R/W
Bit7
5. Select the memory mode (on-chip only, split mode without bank select, split mode with bank
6. Set up timing to interface with off-chip memory or peripherals.
SFR Definition 17.1. EMI0CN: External Memory Interface Control
select, or off-chip only).
The XRAM Page Select Bits provide the high byte of the 16-bit external data memory
address when using an 8-bit MOVX command, effectively selecting a 256-byte page of
RAM.
0x00: 0x0000 to 0x00FF
0x01: 0x0100 to 0x01FF
...
0xFE: 0xFE00 to 0xFEFF
0xFF: 0xFF00 to 0xFFFF
Section “18.1. Ports 0 through 3 and the Priority Crossbar Decoder” on page 238
PGSEL6
R/W
Bit6
for more information about the Crossbar and Port operation and configuration. The
PGSEL5
R/W
Bit5
PGSEL4
R/W
Bit4
PGSEL3
Rev. 1.4
R/W
Bit3
PGSEL2
R/W
Bit2
PGSEL1
R/W
Bit1
Section “18. Port Input/
SFR Address:
PGSEL0 00000000
SFR Page:
R/W
Bit0
0xA2
0
Reset Value
.
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