Espressif ESP32-S2 User Manual

Chapter 4. API Guides
ULP program will continue running after this instruction. To stop the currently running program, use
I_HALT().
I_ST(reg_val, reg_addr, offset_)
Store value from register reg_val into RTC memory.
The value is written to an offset calculated by adding value of reg_addr register and offset_ field (this offset is
expressed in 32-bit words). 32 bits written to RTC memory are built as follows:
• bits [31:21] hold the PC of current instruction, expressed in 32-bit words
• bits [20:18] = 3’b0
• bits [17:16] reg_addr (0..3)
• bits [15:0] are assigned the contents of reg_val
RTC_SLOW_MEM[addr + offset_] = { insn_PC[10:0], 3’b0, reg_addr, reg_val[15:0] }
I_LD(reg_dest, reg_addr, offset_)
Load value from RTC memory into reg_dest register.
Loads 16 LSBs from RTC memory word given by the sum of value in reg_addr and value of offset_.
I_WR_REG(reg, low_bit, high_bit, val)
Write literal value to a peripheral register
reg[high_bit : low_bit] = val This instruction can access RTC_CNTL_, RTC_IO_, SENS_, and RTC_I2C
peripheral registers.
I_RD_REG(reg, low_bit, high_bit)
Read from peripheral register into R0
R0 = reg[high_bit : low_bit] This instruction can access RTC_CNTL_, RTC_IO_, SENS_, and RTC_I2C
peripheral registers.
I_BL(pc_offset, imm_value)
Branch relative if R0 less than immediate value.
pc_offset is expressed in words, and can be from -127 to 127 imm_value is a 16-bit value to compare R0
against
I_BGE(pc_offset, imm_value)
Branch relative if R0 greater or equal than immediate value.
pc_offset is expressed in words, and can be from -127 to 127 imm_value is a 16-bit value to compare R0
against
I_BXR(reg_pc)
Unconditional branch to absolute PC, address in register.
reg_pc is the register which contains address to jump to. Address is expressed in 32-bit words.
I_BXI(imm_pc)
Unconditional branch to absolute PC, immediate address.
Address imm_pc is expressed in 32-bit words.
I_BXZR(reg_pc)
Branch to absolute PC if ALU result is zero, address in register.
reg_pc is the register which contains address to jump to. Address is expressed in 32-bit words.
I_BXZI(imm_pc)
Branch to absolute PC if ALU result is zero, immediate address.
Address imm_pc is expressed in 32-bit words.
I_BXFR(reg_pc)
Branch to absolute PC if ALU overflow, address in register
reg_pc is the register which contains address to jump to. Address is expressed in 32-bit words.
Espressif Systems 1494
Submit Document Feedback
Release v4.4

Espressif ESP32-S2 Specifications

General

Brand	Espressif
Model	ESP32-S2
Category	Single board computers
Language	English