Datasheet

Table Of Contents
Section 7 ROM
Rev. 2.00 Jul. 04, 2007 Page 135 of 692
REJ09B0309-0200
6. Before branching to the programming control program, the chip terminates transfer operations
by SCI3 (by clearing the RE and TE bits in SCR to 0), however the adjusted bit rate value
remains set in BRR. Therefore, the programming control program can still use it for transfer of
program data or verify data with the host. The TXD pin is high (PCR42 = 1, P42 = 1). The
contents of the CPU general registers are undefined immediately after branching to the
programming control program. These registers must be initialized at the beginning of the
programming control program, as the stack pointer (SP), in particular, is used implicitly in
subroutine calls, etc.
7. Boot mode can be cleared by a reset. End the reset after driving the reset pin low, waiting at
least 20 states, and then setting the NMI pin. Boot mode is also cleared when a WDT overflow
occurs.
8. Do not change the TEST pin and NMI pin input levels in boot mode.