Reset; Operation After A Reset; Sp Value After A Reset; Flash Memory - Renesas E1 User Manual

E1/E20/E2/E2 Lite Additional Document
3.4

Reset

3.4.1

Operation after a Reset

After an external pin reset or internal reset, the monitor program performs debug initialization processing.
Consequently, the time from reset occurrence until user program execution differs from that in the actual
device operation. If "No" is selected in Permit flash programming in property of the debug tool, the time
until the user program is executed compared with the time when "Yes" is selected is delayed (max. 100
ms).
3.4.2

SP Value after a Reset

While debugging with the E1/E20/E2/E2 Lite, the SP value after a reset becomes FED0h.
3.5

Flash Memory

3.5.1

Operation for Voltages Not Permitting Flash Memory Rewriting

When a voltage with which rewriting or erasure of flash memory cannot be performed has been selected
or flash programming has been disabled with the debugger's property, the debugger operations that
rewrite flash memory will cause an error in the debugger and the operations will be invalidated.
3.5.2

Notes on Flash Memory Rewriting

In the RL78-S1 core device, a pin reset is always necessary for rewriting of flash memory. For this
reason, a pin reset always occurs at debugger operations (download, rewriting of flash memory from a
memory window, etc.) that accompany rewriting of flash memory.
Since a part of the RAM area (0FFEC6h to 0FFECFh) is used by the E1/E20/E2/E2 Lite at rewriting of
flash memory, the RAM data will be rewritten.
3.6

RESET# Multiplexed Pin

The RESET# pin has multiplexed pin functions. Therefore, if the following conditions are all satisfied,
control by the E1/E20/E2/E2 Lite is no longer possible.
 The reset/port multiplexed pin is used as a port (PORTSELB = 0) due to the option byte setting
(C1h).
 The option byte setting (C1h) has been rewritten during a break.
 "Yes" is selected in the [Mask INTERNAL RESET signal] property of the debugger.
R20UT2937EJ0301 Rev.3.01
Jul 1, 2020
3. Notes on Usage
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