Datasheet
8-Bit RS08 Central Processor Unit (CPU)
• Simplified S08 instruction set with added
high-performance instructions
— LDA, STA, and CLR instructions
support the short addressing mode;
address $0000 to $001F can be
accessed via a single-byte instruction
— ADD, SUB, INC, and DEC instructions
support the tiny addressing mode;
address $0000 to $000F can be
accessed via a single-byte instruction
with reduced instruction cycle
— Shadow PC register instructions: SHA
and SLA
• Pending interrupt indication
• Index addressing via D[X] and X register
• Direct page access to the entire memory
map through paging window
Memory
• On-chip Flash EEPROM
— MC9RS08KA2: 2048 bytes
— MC9RS08KA1: 1024 bytes
• 63 bytes on-chip RAM
Power-Saving Modes
• Wait and stop
• Wakeup from power-saving modes using
real-time interrupt (RTI), KBI, or ACMP
Clock Source
• ICS — Trimmable 20-MHz internal clock
source
— Up to 10-MHz internal bus operation
— 0.2% trimmable resolution, 2%
deviation over temperature and voltage
range
System Protection
• Computer operating properly (COP) reset
running off bus-independent clock source
• Low-voltage detection with reset or stop
wakeup
Peripherals
• MTIM — 8-bit modulo timer
• ACMP — Analog comparator
— Full rail-to-rail supply operation
— Option to compare to fixed internal
bandgap reference voltage
— Can operate in stop mode
• KBI — Keyboard interrupt ports
— Three KBI ports in 6-pin package
— Five KBI ports in 8-pin package
Development Support
• Background debug system
• Breakpoint capability to allow single
breakpoint setting during in-circuit debug
Package Options
• 6-pin dual flat no lead (DFN) package
— Two general-purpose input/output (I/O)
pins
— One general-purpose input pin
— One general-purpose output pin
• 8-pin plastic dual in-line pin (PDIP)
package
— Four general-purpose input/output
(I/O) pins
— One general-purpose input pin
— One general-purpose output pin
• 8-pin narrow body SOIC package
— Four general-purpose input/output
(I/O) pins
— One general-purpose input pin
— One general-purpose output pin
MC9RS08KA2 Features