C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 85

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: 336-1067-2

Bits7-0:
Bit7:
Bit6:
Bit5:
Bits4-3:
Bit2:
Bit1:
Bit0:
R/W
R/W
Bit7
CY
Bit7
SP: Stack Pointer.
The Stack Pointer holds the location of the top of the stack. The stack pointer is incremented before
every PUSH operation. The SP register defaults to 0x07 after reset.
CY: Carry Flag.
This bit is set when the last arithmetic operation resulted in a carry (addition) or a borrow (subtrac-
tion). It is cleared to logic 0 by all other arithmetic operations.
AC: Auxiliary Carry Flag
This bit is set when the last arithmetic operation resulted in a carry into (addition) or a borrow from
(subtraction) the high order nibble. It is cleared to logic 0 by all other arithmetic operations.
F0: User Flag 0.
This is a bit-addressable, general purpose flag for use under software control.
RS1-RS0: Register Bank Select.
These bits select which register bank is used during register accesses.
OV: Overflow Flag.
This bit is set to 1 under the following circumstances:
• An ADD, ADDC, or SUBB instruction causes a sign-change overflow.
• A MUL instruction results in an overflow (result is greater than 255).
• A DIV instruction causes a divide-by-zero condition.
The OV bit is cleared to 0 by the ADD, ADDC, SUBB, MUL, and DIV instructions in all other cases.
F1: User Flag 1.
This is a bit-addressable, general purpose flag for use under software control.
PARITY: Parity Flag.
This bit is set to logic 1 if the sum of the eight bits in the accumulator is odd and cleared if the sum is
even.
RS1
0
0
1
1
R/W
R/W
AC
Bit6
Bit6
RS0
0
1
0
1
R/W
R/W
Bit5
Bit5
F0
Figure 9.6. PSW: Program Status Word
Register Bank
Figure 9.5. SP: Stack Pointer
RS1
R/W
R/W
Bit4
Bit4
0
1
2
3
RS0
R/W
R/W
Bit3
Bit3
0x08 - 0x0F
0x18 - 0x1F
0x00 - 0x07
0x10 - 0x17
Rev. 1.1
Address
R/W
R/W
OV
Bit2
Bit2
R/W
R/W
Bit1
Bit1
F1
(bit addressable)
C8051F320/1
PARITY
R/W
Bit0
Bit0
R
SFR Address:
SFR Address:
00000000
00000111
Reset Value
Reset Value
0xD0
0x81
85