Toshiba TLCS-900/H1 Series Manual page 441

3.21.3 Outline of Boot Operation
There are 3 downloading methods: NAND flash, UART and USB.
After reset, a boot program in the boot ROM operates as shown in the Figure 3.21.2 flow
chart.
Internal RAM use is the same regardless of downloading method, and is shown in Figure
3.21.3.
No
Note 1: When USB downloading is used, a special USB device driver and application software are needed on the
PC.
Note 2: When UART downloading is used, special application software is needed on the PC.
Note 3: (a), (b) and (c) on the flow chart show the points at which external port pins are set.
Refer to Table 3.21.3 for details.
Figure 3.21.2 Flow Chart Outline of Internal Boot ROM
Start
Clock setting
= f
･ f
FPH OSCH
= f ∗ 16/3
･ f
USB OSCH
(a)
Check NAND flash
OK ?
(b)
No
Check
UART OK ?
No
Check
USB OK ?
Yes
Download
with USB
Branch to internal RAM
92CH21-439
Yes
Download
from NAND flash
(c)
Yes
Download
with UART
TMP92CH21
2009-06-19