R5F21256SNFP#U0 Renesas Electronics America, R5F21256SNFP#U0 Datasheet - Page 22

• Manufacturer Part Number: R5F21256SNFP#U0
• Description: IC R8C MCU FLASH 32K 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21256SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Rev.2.00 Oct 17, 2005
REJ09B0001-0200
1.1 Features of R8C/Tiny Series
Chapter 1 Overview
The R8C/Tiny Series of single-chip microcomputers was developed for embedded applications.
The R8C/Tiny Series supports instructions tailored for the C language, with frequently used instructions
implemented in one-byte op-code. It thus allows development of efficient programs with reduced memory
requirements when using either assembly language or C. Furthermore, some instructions can be executed
in a single clock cycle, enabling fast arithmetic processing.
The instruction set comprises 89 discrete instructions matched to the R8C’s many addressing modes. This
powerful instruction set provides support for register-register, register-memory, and memory-memory op-
erations, as well as arithmetic/logic operations using single-bit and 4-bit data.
Some R8C/Tiny Series models incorporate an on-chip multiplier, allowing for high-speed computation.
1.1.1 Features of R8C/Tiny Series
1.1.2 Speed Performance
Data registers:
Address registers: Two 16-bit registers
Base registers:
Instructions suited to C language (stack frame manipulation): ENTER, EXITD, etc.
Instructions that do not discriminate by register or memory area MOV, ADD, SUB, etc.
Powerful bit manipulation instructions: BNOT, BTST, BSET, etc.
4-bit transfer instructions: MOVLL, MOVHL, etc.
Frequently used 1-byte instructions: MOV, ADD, SUB, JMP, etc.
High-speed 1-cycle instructions: MOV, ADD, SUB, etc.
Minimum 1-cycle instructions: Of 89 instructions, 20 are 1-cycle instructions. (Approximately 75% of
instructions execute in five cycles or fewer.)
Register-register transfer
Register-memory transfer
Register-register addition/subtraction 2 cycles
8 bits x 8 bits register-register operation 4 cycles
16 bits x 16 bits register-register operation 5 cycles
16 bits / 8 bits register-register operation 18 cycles
32 bits / 16 bits register-register operation 25 cycles
Register configuration
Versatile instruction set
Fast instruction execution time
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Four 16-bit registers (of which two can be used as 8-bit registers)
Two 16-bit registers
2 cycles
2 cycles
1.1 Features of R8C/Tiny Series