Maxim Integrated 71M6521BE Energy Meter IC Family Software - Manual (Page 102)

71M652X Software User’s Guide
Revision 1.7 TERIDIAN Proprietary 102 of 138
© Copyright 2005-2007 TERIDIAN Semiconductor Corporation
6.1.2 80515 Features
Below is a summary of the 80515 features:
♦
Control Unit
ƒ 8-bit instruction decoder
ƒ Reduced instruction cycle time up to 12 times
♦
Arithmetic-Logic Unit
ƒ 8 bit arithmetic and logical operations
ƒ Boolean manipulations
ƒ 8 x 8 bit multiplication and 8 / 8 bit division
♦
32-bit Input/Output ports
ƒ Four 8-bit I/O ports
ƒ Alternate port functions such as external interrupts and serial interfaces are separated, providing
extra port pins when compared with the standard 8051
♦
Two 16-bit Timer/Counters
♦
Two Serial Peripheral Interfaces in full duplex mode, capable of parity generation
ƒ Synchronous mode, fixed baud rate, Serial 0 only
ƒ 8-bit UART mode, variable baud rate
ƒ 9-bit UART mode, fixed baud rate, Serial 0 only
ƒ 9-bit UART mode, variable baud rate
ƒ 7E1, 7O1, 7N2, 7E2, 7O2, 8N1, 8E1, 8O1, 8N2, 9N1 data formats supported
ƒ Two Internal baud rate generators independent from timers
♦
Interrupt Controller
ƒ Four priority levels with 11 interrupt sources
♦
15 bit Programmable Watchdog Timer
♦
Internal Data Memory interface
ƒ Can address up to 256B of internal data memory space
♦
External Memory interface
ƒ Can address up to 64kB of external program memory (32KB, 16KB or 8KB provided on-chip)
ƒ Can address up to 2kB of external data memory plus 512 bytes CE DRAM
ƒ Separate address/data bus to allow easy connection to memories
ƒ Variable length code fetch and MOVC to access fast/slow program memory
ƒ Variable length MOVX to access fast/slow RAM or peripherals
ƒ Dual data pointer for fast data block transfer
♦
Special Function Registers interface
ƒ Services up to 74 external special function registers