M32CSLASH86 datasheet(62/505 Pages) RENESAS

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Page 39

5. Reset

)

(

____________

Table 5.1 Pin States while RESET Pin is Held "L"

Pin States(2)

Pin Name

CNVSS=VSS

CNVSS=VCC

BYTE=VSS

BYTE=VCC

Input port (high-impedance)

Inputs data (high-impedance)

Input port (high-impedance)

Inputs data (high-impedance)

Input port (high-impedance)

P2, P3, P4 Input port (high-impedance)

Output addresses (indeterminate)

P50

Input port (high-impedance)

______

Outputs the WR signal ("H")(2)

P51

Input port (high-impedance)

________

Outputs the BHE signal (indeterminate)

P52

Input port (high-impedance)

_____

Outputs the RD signal ("H")(2)

P53

Input port (high-impedance)

Outputs the BCLK(2)

P54

Input port (high-impedance)

_________

Outputs the HLDA signal (Output signal depends on an input

__________

signal to the HOLD pin.)(2)

P55

Input port (high-impedance)

__________

Inputs the HOLD signal (high-impedance)

P56

Input port (high-impedance)

Outputs an "H" signal(2)

P57

Input port (high-impedance)

________

Inputs the RDY signal (high-impedance)

P6 to P15(1) Input port (high-impedance)

Input port (high-impedance)

NOTES:

1. The availability of pull-up resistors is indeterminate until internal supply voltage stabilizes.

2. Each port is in this state after power is on and internal supply voltage stabilizes, but in an indeterminate

state until internal supply voltage stabilizes.

5.2 Brown-Out Detection Reset (Hardware Reset 2)

Pins, the CPU and SFR are reset by using the built-in voltage detection circuit, which monitors the voltage

applied to the VCC pin.

When the VC26 bit in the VCR2 register is set to "1" (reset level detection circuit enabled), pins, the CPU

and SFR are reset as soon as the voltage applied to the VCC pin drops to Vdet3 or below.

Then, pins, the CPU and SFR are reset as soon as the voltage applied to the VCC pin reaches Vdet3r or

above. The microcomputer executes the program in an address determined by the reset vector.

The microcomputer executes the program after detecting Vdet3r and waiting

td(S-R) ms . The same pins and

registers are reset by the hardware reset 1 and brown-out detection reset, and are also placed in the same

reset state.

The microcomputer cannot exit stop mode by brown-out detection reset.

Figure 5.3 shows an example of brown-out detection reset operation.

NOTES:

1. Brown-out detection reset cannot be used in M32C/86T.

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