M16C80 Datasheet, PDF (313/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
32. Standard serial I/O mode
Read Lock Bit Status Command
This command reads the lock bit status of the specified block. Execute the read lock bit status com-
mand as explained here following.
(1) Transfer the “7116” command code with the 1st byte.
(2) Transfer addresses A8 to A15 and A16 to A23 with the 2nd and 3rd bytes respectively.
(3) The lock bit data of the specified block is output with the 4th byte. The 6th bit (D6) of output data
is the lock bit data. Write the highest address of the specified block for addresses A8 to A23.
CLK1
RxD1
(M16C reception data)
TxD1
(M16C transmit data)
RTS1(BUSY)
7116
A8 to A16 to
A15
A23
DQ6
Figure 32.8 Timing for reading lock bit status
Lock Bit Enable Command
This command enables the lock bit in blocks whose bit was disabled with the lock bit disable com-
mand. The command code “7A16” is sent with the 1st byte of the serial transmission. This command
only enables the lock bit function; it does not set the lock bit itself.
CLK1
RxD1
(M16C reception data)
TxD1
(M16C transmit data)
RTS1(BUSY)
Figure 32.9 Timing for enabling the lock bit
Rev.1.00 Aug. 02, 2005 ^{Page 302} of 329
REJ09B0187-0100
7A16