DS87C520-ECL Maxim Integrated Products, DS87C520-ECL Datasheet - Page 18

• Manufacturer Part Number: DS87C520-ECL
• Description: IC MCU EPROM/ROM 33MHZ HS 44TQFP
• Manufacturer: Maxim Integrated Products
• Series: 87Cr

Specifications of DS87C520-ECL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: DS87C520
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: UART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: DS87C520ECL

Table 6. PMM Control and Status Bit Summary
CD1, CD0
XTOFF
XT/RG
RGMD
SPTA1
SPRA1
SPTA0
SPRA0
XTUP
SWB
BIT
HIP
PIP
LIP
LOCATION
STATUS.7
STATUS.6
STATUS.5
STATUS.4
STATUS.3
STATUS.2
STATUS.1
STATUS.0
PMR.7,
EXIF.3
EXIF.2
PMR.6
PMR.5
PMR.3
Control. XT/RG = 1, runs from crystal or external
clock; XT/RG = 0, runs from internal ring oscillator.
Status. RGMD = 1, CPU clock = ring; RGMD = 0,
CPU clock = crystal.
Control. CD1, 0 = 01, 4 clocks; CS1, 0 = 10, PMM1;
CD1, 0 = 11, PMM2.
Control. SWB = 1, hardware invokes switchback to 4
clocks, SWB = 0, no hardware switchback.
Control. Disables crystal operation after ring is
selected.
Status. 1 indicates a power-fail interrupt in service
Status. 1 indicates high priority interrupt in service.
Status. 1 indicates low priority interrupt in service.
Status. 1 indicates that the crystal has stabilized.
Status. Serial transmission on serial port 1.
Status. Serial word reception on serial port 1.
Status. Serial transmission on serial port 0.
Status. Serial word reception on serial port 0.
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
FUNCTION
18 of 43
.
RESET
0, 1
X
0
0
0
0
0
0
1
0
0
0
0
0 to 1 only when
XTUP = 1 and
XTOFF = 0
None
Write CD1, 0 = 10
or 11 only from
CD1, 0 = 01
Unrestricted
1 only when
XT/RG = 0
None
None
None
None
None
None
None
None
WRITE ACCESS