M32C80 Datasheet, PDF (327/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
24. Precautions (Bus)
24.2 Bus
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24.2.1 HOLD Signal
When entering microprocessor mode or memory expansion mode from single-chip mode and using
__________
HOLD input, set the PM01 and PM00 bits to "112" (microprocessor mode) or to "012" (memory expansion
mode) after setting the PD4_7 to PD4_0 bits in the PD4 register and the PD5_2 to PD5_0 bits in the PD5
register to "0" (input mode).
_____ _______
_______
______ ______ ________ ______ _______ ________
P40 to P47 (A16 to A22, A23, CS0 to CS3, MA8 to MA12) and P50 to P52 (RD/WR/BHE, RD/WRL/WRH)
__________
are not placed in high-impedance states even when a low-level ("L") signal is applied to the HOLD pin, if
the PM01 and PM00 bits are set to "112" (microprocessor mode) or to "012" (memory expansion mode)
after setting the PD4_7 to PD4_0 bits in the PD4 register and the PD5_2 to PD5_0 bits in the PD5 register
to "1" (output mode) in single-chip mode.
Rev. 1.00 Nov. 01, 2005 ^{Page 308} of 330
REJ09B0271-0100