M16C Datasheet, PDF (51/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Oscillation Stop Detection Function
Table 5-6. Port status after an internal reset is generated
Pin name
P0
Single-chip mode
Input port (floating)
Pin Status
Microprocessor mode/Memory expansion mode
BYTE = VSS
BYTE = Vcc
Data input (floating)
Data input (floating)
P1
Input port (floating)
Data input (floating)
Input port (floating)
P2, P3, P40 to P43 Input port (floating)
Address output (undefined) Address output (undefined)
P44
Input port (floating)
CS0 output ("H" level output) CS0 output ("H" level output)
P45 to P47
Input port (floating)
Input port (floating)
(Pull-up resistance is ON.)
Input port (floating)
(Pull-up resistance is ON.)
P50
Input port (floating)
P51
Input port (floating)
P52
Input port (floating)
P53
Input port (floating)
P54
Input port (floating)
P55
P56
P57
P6, P7, P80 to P84
P86, P87, P9, P10
Input port (floating)
Input port (floating)
Input port (floating)
Input port (floating)
WR output ("H" level output) WR output ("H" level output)
BHE output (undefined)
BHE output (undefined)
RD output ("H" level output) RD output ("H" level output)
BCLK output
BCLK output
HLDA output (Output value HLDA output (Output value
depends on HOLD pin input.) depends on HOLD pin put.)
HOLD input (floating)
HOLD input (floating)
ALE output ("L" level output) ALE output ("L" level output)
RDY input (floating)
RDY input (floating)
Input port (floating)
Input port (floating)
Oscillation stop detection interrupt
or watchdog timer interrupt
is generated
Read CM22
CM22 = 1 ?
NO
YES
Jump to the execution program
for oscillation stop detection interrupt
Jump to the execution program
for watchdog timer interrupt
Figure 5-10. Flow of the judgment
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