how to save memory to file in H8SX-1544 R5F61544FPV using jtag
using programmer e10a without chip off
FDT supports the H8SX-1544 using the E8a or straight RS232 in boot-mode:
Available MCUs' for Flash Development Toolkit
HEW would support the MCU in debug mode, it looks like it supports both E10A and E8a for H8SX-1544.
Target Device for E10A-USB(HS0005KCU01H/HS0005KCU02H)
but boot mode can only for programming tts use uart
That is correct, boot-mode only support programming, not debugging.