Brown-Out Detection Reset (Hardware Reset 2) - Renesas M16C/62P Series Hardware Manual

M16C/62P Group (M16C/62P, M16C/62PT)
Table 5.1 Pin Status When RESET Pin Level is "L"
Pin Name
P0
P1
P2, P3, P4_0 to P4_3
P4_4
P4_5 to P4_7
P5_0
P5_1
P5_2
P5_3
P5_4
P5_5
P5_6
P5_7
P6, P7, P8_0 to P8_4,
P8_6, P8_7, P9, P10
P11, P12, P13, P14_0,
(2)
P14_1
NOTES:
1. Shown here is the valid pin state when the internal power supply voltage has stabilized after power
on.
When CNVSS = VCC1, the pin state is indeterminate until the internal power supply voltage
stabilizes.
2. P11, P12, P13, P14_0, P14_1 pins exist in 128-pin version.
5.2

Brown-out Detection Reset (Hardware Reset 2)

The microcomputer resets pins, the CPU or SFR by setting the built-in voltage detect circuit. The voltage detect
circuit monitors the voltage applied to the VCC1 pin.
When the VC26 bit in the VCR2 register is set to "1" (reset level detect circuit enabled), the microcomputer
resets pins, the CPU and SFR as soon as the voltage that is applied to the VCC1 pin drops to Vdet3 or below.
The microcomputer resets pins and it is in a reset state when the voltage that is applied to the VCC1 pin is
Vdet3 or below. The microcomputer resets pins, CPU and SFR with Vdet3r or above and it executes the
program from the 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 (hardware reset 2), and are also placed in the same reset state.
The microcomputer cannot exit stop mode by the brown-out detection reset (hardware reset 2).
Rev.2.41 Jan 10, 2006
REJ09B0185-0241
http://www.xinpian.net
CNVSS = VSS
Input port Data input
Input port Data input
Input port Address output (underfined)
Input port CS0 output ("H" is output)
Input port Input port (Pulled high)
Input port WR output ("H" is output)
Input port BHE output (undefined)
Input port RD output ("H" is output)
Input port BCLK output
Input port HLDA output (The output
value
depends on the input to the
HOLD pin)
Input port HOLD input
Input port ALE output ("L" is output)
Input port RDY input
Input port Input port
Input port Input port
Page 42 of 390
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Status
CNVSS = VCC1
BYTE = VSS
Data input
Input port
Address output (underfined)
CS0 output ("H" is output)
Input port (Pulled high)
WR output ("H" is output)
BHE output (undefined)
RD output ("H" is output)
BCLK output
HLDA output (The output
value
depends on the input to the
HOLD pin)
HOLD input
ALE output ("L" is output)
RDY input
Input port
Input port
5. Reset
(1)
BYTE = VCC1
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