M16C62 Datasheet, PDF (219/231 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Appendix Standard Serial I/O Mode
Mitsubishi microcomputers
M16C / 62 Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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) Send the “7116” command code in the 1st byte of the transmission.
(2) Send addresses A8 to A15 and A16 to A23 in the 2nd and 3rd bytes of the transmission respec-
tively.
(3) The lock bit data of the specified block is output in the 4th byte of the transmission. 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 1.25.9. 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 in 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)
7A16
TxD1
(M16C transmit data)
RTS1(BUSY)
Figure 1.25.10. Timing for enabling the lock bit
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