SX28AC/SS Parallax Inc, SX28AC/SS Datasheet - Page 16

• Manufacturer Part Number: SX28AC/SS
• Description: IC MCU 2K FLASH 50MHZ 28SSOP
• Manufacturer: Parallax Inc
• Series: SXr

Specifications of SX28AC/SS

• Core Processor: RISC
• Core Size: 8-Bit
• Speed: 75MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 20
• Program Memory Size: 3KB (2K x 12)
• Program Memory Type: FLASH
• Ram Size: 136 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Product: Microcontroller Basic Stamps
• Flash: 2 KBytes
• Timers: 8 bit
• Operating Supply Voltage: 3 to 5.5 V
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: No RoHS Version Available

Parallax SX20AC/SX28AC
5.2.
IRCTRIM2:
IRCTRIM
PINS
OPTIONX
STACKX
CF
BOR1: BOR0
BORTR1:
BORTR0
BP1:BPO
5.3.
© Parallax Inc.
IRCTRIM2
Bit 11
Bit 11
1
FUSEX Word (Read/Program via Programming Command)
DEVICE Word (Hard-Wired Read-Only)
0
/
PINS
1
Internal RC oscillator trim bits. This 3-bit field adjusts the operation of the internal RC oscillator to make it
operate within the target frequency range 4 MHz plus or minus 8%. Parts are shipped from the factory
untrimmed. The device relies on the programming to0l to provide the trimming function.
000b = minimum frequency
111b = maximum frequency
each step about 3%
Selects the number of pins.
0 = 18/20 pins
1 = 28 pins
OPTION Register Extension and Stack Extension. Set to 1 to disable the programmability of bit 6 and bit 7
in the OPTION register, the RTW and RTE_IE bits (in other words, to force these two bits to 1) and to
limit the program stack size to two locations. Clear to 0 to enable programming of the RTW and RTE_IE
bits in the OPTION register, and to extend the stack size to eight locations.
Active low - makes carry bit input to ADD and SUB instructions.
Brown-Out Reset: These bits enable or disable the brown-out reset function and set the brown-out threshold
voltage as follows:
00b = 4.2 V
01b = 2.6 V
10b = 2.2 V
11b = Brown-Out disabled
Brown-Out trim bits (parts are shipped out of factory untrimmed).
01b = minimum threshold voltage
00b = LOW
11b = HIGH
10b = maximum threshold voltage
00b = 1 page, 1 bank
01b = 2 pages, 1 bank
10b = 4 pages, 4 banks
11b = 4 pages, 8 banks
IRCTRIM1
1
IRCTRIM0
1
(default configuration)
OPTIONX
1
STACKX
/
Page 16 of 51
1
CF
0
BOR1
BOR0
0
BORTR1
1
1
BORTR0
Rev 1.6 11/20/2006
www.parallax.com
1
BP1
Bit 0
0
Bit 0
BP0