UPD70F3713GC-8BS-A Renesas Electronics America, UPD70F3713GC-8BS-A Datasheet - Page 33

• Manufacturer Part Number: UPD70F3713GC-8BS-A
• Description: MCU 32BIT V850ES/LX2 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Ix2r

Specifications of UPD70F3713GC-8BS-A

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CSI, UART/USART
• Peripherals: LVD, PWM, WDT
• Number Of I /o: 39
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 6K x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

3.2.1
r0
r1
r2
r3
r4
r5
r6 to r29
r30
r31
The program register set includes general-purpose registers and a program counter.
(1) General-purpose registers (r0 to r31)
(2) Program counter (PC)
Name
Thirty-two general-purpose registers, r0 to r31, are available. All of these registers can be used as a data
variable or address variable.
However, r0 and r30 are implicitly used by instructions and care must be exercised when using these
registers. r0 always holds 0 and is used for operations that use 0 and offset 0 addressing. r30 is used as a
base pointer when performing memory access with the SLD and SST instructions.
Also, r1, r3 to r5, and r31 are implicitly used by the assembler and C compiler. Therefore, before using these
registers, their contents must be saved so that they are not lost, and they must be restored to the registers
after the registers have been used. There are cases when r2 is used by the real-time OS. If r2 is not used by
the real-time OS, r2 can be used as a variable register.
This register holds the address of the instruction under execution. The lower 26 bits of this register are valid,
and bits 31 to 26 are fixed to 0. If a carry occurs from bit 25 to bit 26, it is ignored.
Bit 0 is fixed to 0, and branching to an odd address cannot be performed.
PC
Program register set
31
Zero register
Assembler-reserved register
Address/data variable register (when r2 is not used by the real-time OS to be used)
Stack pointer
Global pointer
Text pointer
Address/data variable register
Element pointer
Link pointer
Fixed to 0
Usage
26 25
Table 3-1. General-Purpose Registers
CHAPTER 3 CPU FUNCTION
Instruction address under execution
User’s Manual U17716EJ2V0UD
Always holds 0
Working register for generating 32-bit immediate
Used to generate stack frame when function is called
Used to access global variable in data area
Register to indicate the start of the text area (area for placing program code)
Base pointer when memory is accessed
Used by compiler when calling function
Operation
1 0
0
00000000H
After reset
31