TOOLSTICK560DC Silicon Laboratories Inc, TOOLSTICK560DC Datasheet - Page 94
![DAUGHTER CARD TOOLSTICK F560](/photos/9/25/92542/toolstick560dc_sml.jpg)
TOOLSTICK560DC
Manufacturer Part Number
TOOLSTICK560DC
Description
DAUGHTER CARD TOOLSTICK F560
Manufacturer
Silicon Laboratories Inc
Series
ToolStickr
Type
MCUr
Specifications of TOOLSTICK560DC
Contents
Daughter Card
Processor To Be Evaluated
C8051F55x, C8051F56x, C8051F57x
Interface Type
USB
Operating Supply Voltage
2.7 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F55x, C8051F56x, C8051F57x
For Use With
336-1345 - TOOLSTICK BASE ADAPTER336-1182 - ADAPTER USB DEBUG FOR C8051FXXX
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1719
- Current page: 94 of 302
- Download datasheet (3Mb)
C8051F55x/56x/57x
upper 128 bytes of data memory. Figure 11.1 illustrates the data memory organization of the
C8051F55x/56x/57x.
11.2.1.1. General Purpose Registers
The lower 32 bytes of data memory, locations 0x00 through 0x1F, may be addressed as four banks of gen-
eral-purpose registers. Each bank consists of eight byte-wide registers designated R0 through R7. Only
one of these banks may be enabled at a time. Two bits in the program status word, RS0 (PSW.3) and RS1
(PSW.4), select the active register bank (see description of the PSW in SFR Definition 10.6). This allows
fast context switching when entering subroutines and interrupt service routines. Indirect addressing modes
use registers R0 and R1 as index registers.
11.2.1.2. Bit Addressable Locations
In addition to direct access to data memory organized as bytes, the sixteen data memory locations at 0x20
through 0x2F are also accessible as 128 individually addressable bits. Each bit has a bit address from
0x00 to 0x7F. Bit 0 of the byte at 0x20 has bit address 0x00 while bit7 of the byte at 0x20 has bit address
0x07. Bit 7 of the byte at 0x2F has bit address 0x7F. A bit access is distinguished from a full byte access by
the type of instruction used (bit source or destination operands as opposed to a byte source or destina-
tion).
The MCS-51™ assembly language allows an alternate notation for bit addressing of the form XX.B where
XX is the byte address and B is the bit position within the byte. For example, the instruction:
MOV
C, 22.3h
moves the Boolean value at 0x13 (bit 3 of the byte at location 0x22) into the Carry flag.
11.2.1.3. Stack
A programmer's stack can be located anywhere in the 256-byte data memory. The stack area is desig-
nated using the Stack Pointer (SP) SFR. The SP will point to the last location used. The next value pushed
on the stack is placed at SP+1 and then SP is incremented. A reset initializes the stack pointer to location
0x07. Therefore, the first value pushed on the stack is placed at location 0x08, which is also the first regis-
ter (R0) of register bank 1. Thus, if more than one register bank is to be used, the SP should be initialized
to a location in the data memory not being used for data storage. The stack depth can extend up to
256 bytes.
94
Rev. 1.1
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