HD64F36022 datasheet(109/384 Pages) RENESAS

109 / 384 page

Section 7 ROM

Rev. 4.00 Sep. 23, 2005 Page 83 of 354

REJ09B0025-0400

4. After matching the bit rates, the chip transmits one H'00 byte to the host to indicate the

completion of bit rate adjustment. The host should confirm that this adjustment end indication

(H'00) has been received normally, and transmit one H'55 byte to the chip. If reception could

not be performed normally, initiate boot mode again by a reset. Depending on the host's

transfer bit rate and system clock frequency of this LSI, there will be a discrepancy between

the bit rates of the host and the chip. To operate the SCI properly, set the host's transfer bit rate

and system clock frequency of this LSI within the ranges listed in table 7.3.

5. In boot mode, a part of the on-chip RAM area is used by the boot program. The area H'F780 to

H'FEEF is the area to which the programming control program is transferred from the host.

The boot program area cannot be used until the execution state in boot mode switches to the

programming control program.

6. Before branching to the programming control program, the chip terminates transfer operations

by SCI3 (by clearing the RE and TE bits in SCR3 to 0), however the adjusted bit rate value

remains set in BRR. Therefore, the programming control program can still use it for transfer of

write data or verify data with the host. The TxD pin is high (PCR22 = 1, P22 = 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.

Do not change the TEST pin and

NMI pin input levels in boot mode.

HD64F36022 Datasheet(PDF) 109 Page - Renesas Technology Corp