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SH79F3283
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7.3.2 Flash Operation in ICP Mode
ICP has two modes: four JTAG pins and single SWE pin. ICP mode is performed without removing the micro-controller from
the system. In ICP mode, the user system must be power-off, and the programmer can refresh the program memory through
ICP programming interface. The ICP programming interface consists of 6 pins (V
DD
, GND, TCK, TDI, TMS, TDO/SWE).
SH79F3283 provides two types JTAG pins, the four JTAG pins (TDO, TDI, TCK, TMS) and the single SWE pin (SWE) are
used to enter the programming mode. Only after the four pins are inputted the specified waveform, the CPU will enter the
programming mode. For more detail description please refers to the FLASH Programmer’s user guide.
In ICP mode, all the flash operations are completed by the programmer through 6-wire interface. Since the program signal is
very sensitive, 6 jumpers are needed (V
DD
, GND, TDO/SWE, TDI, TCK, TMS) to separate the program pins from the
application circuit, as show in the following diagram.
Four JTAG Pins Mode:
MCU
TCK
TDI
TDO
GND
To Application
Circuit
Jumper
Flash
Programmer
V
DD
TMS
Single SWE Pin Mode:
MCU
SWE
GND
To Application
Circuit
Jumper
Flash
Programmer
VDD
The recommended steps are as following:
(1) The jumpers must be open to separate the programming pins from the application circuit before programming.
(2) Connect the programming interface with programmer and begin programming.
(3) Disconnect programmer interface and connect jumpers to recover application circuit after programming is complete.