C8051F326DK Silicon Laboratories Inc, C8051F326DK Datasheet - Page 69
C8051F326DK
Manufacturer Part Number
C8051F326DK
Description
KIT DEV FOR C8051F326/7
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F326DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F326/F327
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F326
Silicon Family Name
C8051F32x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F326, C8051F327
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1306
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9.
The C8051F326/7 devices include 1280 bytes of on-chip XRAM. This XRAM space is split into user RAM
(addresses 0x0000–0x03FF) and USB0 FIFO space. The USB0 FIFO space is only accessible through the
USB FIFO registers.
9.1.
User XRAM can be accessed using the external move instruction (MOVX) and the data pointer (DPTR), or
using MOVX indirect addressing mode. If the MOVX instruction is used with an 8-bit address operand
(such as @R1), then the high byte of the 16-bit address is provided by the External Memory Interface Con-
trol Register (EMI0CN as shown in Figure 9.1). Note: the MOVX instruction is also used for writes to the
Flash memory. See Section “8. Flash Memory” on page 63 for details. The MOVX instruction accesses
XRAM by default.
For any of the addressing modes, the upper 6 bits of the 16-bit external data memory address word are
"don't cares". As a result, the 1024-byte RAM is mapped modulo style over the entire 64k external data
memory address range. For example, the XRAM byte at address 0x0000 is also at address 0x0400,
0x0800, 0x0C00, 0x1000, etc.
External RAM
Accessing User XRAM
0 x F F F F
0 x0 3 F F
0 x0 4 0 0
0 x0 0 0 0
Figure 9.1. External Ram Memory Map
0 x0 0 0 0 to 0 x 0 3 F F , w ra p p e d
S a m e 1 0 2 4 b y te s a s fro m
o n 1 K -b y te b o u n d a rie s
1 0 2 4 B y te s
X R A M
Rev. 1.1
A c ce ss e d o n ly th ro u g h U S B
F IF O re g iste rs (in a c ce ss ib le
u s in g th e M O V X in s tru ctio n)
A cc e s s e d w ith th e M O V X
in stru c tio n
U S B F IF O s
2 5 6 B y te s
C8051F326/7
69
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