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R5F21143SP View Datasheet(PDF) - Renesas Electronics

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R5F21143SP Datasheet PDF : 277 Pages
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R8C/14 Group, R8C/15 Group
5. Reset
5.1 Hardware Reset
A reset is applied using the RESET pin. When an “L” signal is applied to the RESET pin while the power
supply voltage meets the recommended performance condition, the pins, CPU and SFR are reset (refer
to Table 5.2 Pin Status after Reset). When the input level applied to the RESET pin changes “L” to “H”,
the program is executed beginning with the address indicated by the reset vector. After reset, the low-
speed on-chip oscillator clock divided-by-8 is automatically selected for the CPU clock.
Refer to 4. Special Function Register (SFR) for the status of the SFR after reset.
The internal RAM is not reset. If the RESET pin is pulled “L” during writing to the internal RAM, the
internal RAM will be in indeterminate state.
Figure 5.4 shows the Example of Hardware Reset Circuit and Operation and Figure 5.5 shows the
Example of Hardware Reset Circuit (Use Example of External Power Supply Voltage Detection Circuit)
and Operation.
5.1.1 When the power supply is stable
(1) Apply an “L” signal to the RESET pin.
(2) Wait for 500µs (1/fRING-S×20).
(3) Apply an “H” signal to the RESET pin.
5.1.2 Power on
(1) Apply an “L” signal to the RESET pin.
(2) Let the power supply voltage increase until it meets the recommended performance condition.
(3) Wait for td(P-R) or more until the internal power supply stabilizes (Refer to 19. Electrical
Characteristics).
(4) Wait for 500µs (1/fRING-S×20).
(5) Apply an “H” signal to the RESET pin.
Rev.2.10 Jan 19, 2006 Page 21 of 253
REJ09B0164-0210
 

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