Bob Lunn
08/11/97 02:49 PM


I thought the list might be interested in a brief summary of
the microcontroller section of the Microchip 'Future Products'
document.

8-pin/12-bit    16 bytes of data eeprom

8-pin/14-bit    16 bytes of data eeprom
eprom            4 ch x 8-bit A/D

8-pin/14-bit    16 bytes of data eeprom
flash            4 ch x 10-bit A/D
               serial I/O (uart?)

14-pin/14-bit   note the new package option
eprom            internal 4MHz oscillator
               4 ch x 10-bit A/D
               16-bit timer (runs during sleep)
               capture/compare/pwm module

18-pin/14-bit   128 bytes of data eeprom
eprom            analog comparators

18-pin/14-bit   2k bytes of program eeprom
flash            128 bytes of data eeprom
               internal oscillator (4MHz?)
               analog comparators
               4 ch x 10-bit A/D
               16-bit timer (runs during sleep)
               capture/compare/pwm module
               usart

20-pin/14-bit   note the new package option
flash            4k bytes of program eeprom
               128 bytes of data eeprom
               internal oscillator (4MHz?)
               4x PLL (for oscillator?)
               programmable gain amp (for oscillator?)
               4 ch (2 ch diff) x 10-bit A/D
               16-bit timer (runs during sleep)
               capture/compare/pwm module
               usart

28 & 40-pin     internal oscillator (4MHz?)
eprom            5 ch, 8 ch, 11 ch x 10-bit A/D
               16-bit timer (runs during sleep)
               8-bit timer (in addition)
               capture/compare/pwm module
               usart

28 & 40-pin     8k bytes of program eeprom
flash            256 bytes of data eeprom
               processor read/write to program eeprom
               internal oscillator (4MHz?)
               10-bit A/D (runs during sleep)
               analog comparator
               16-bit timer (runs during sleep)
               8-bit timer (in addition)
               capture/compare/pwm module
               usart
               parallel slave port


Notes:

     There seems to be a distinction between the 4MHz RC
     oscillator used on the 8-pin/12-bit cores, and the
     "precision" R/C oscillator used on the 8-pin/14-bit
     cores.

     There are some curious references to 'multi-speed
     clocking' (eg: 16F825).

     Some of the new flash parts (though only in the 28-
     and 40-pin packages?) support 5V only writes to
     program eeprom.  This would appear to allow remote
     in-circuit programming, and self-modifying code.

     Note the new 14-pin package 16C471/472.

     Note the new 20-pin package 16F787 (this is the one
     with the PLL to give one instruction cycle per clock
     cycle?).  This is a _powerful_ looking chip.

     The operating speed of most 'flash' based devices is
     increased to 20MHz.

     A new family of devices designated 16C1xx is announced.
     This has a 16-bit core like the 17Cxxx family, though
     any actual similarity between the two is impossible
     to determine.  This new family is distinguished by a
     'C-compiler optimized instruction set', a 'software
     stack capability', and an 'independant 32 kHz timer
     oscillator'.  These devices all feature large memory
     sizes: 8k to 16k program memory; and 512 to 1536 bytes
     data memory.  The stand-out member of the family is
     the 16C185 which 'implements FULL CAN model'.

     Two new members of the 17Cxxx family are announced
     that support IIC master mode (17C762/766).  However,
     these are only available in surface mount packages.

___Bob