Toshiba H1 Series, TLCS-900, TMP92CZ26AXBG TMP92CZ26A , 92CZ26A-45, 3.4.3 Outline of Boot Operation

TMP92CZ26A
92CZ26A-45
3.4.3 Outline of Boot Operation
The method for download ing a user program can be select ed from two types: from UART,
or via USB.
After reset, the boot pr ogram on the internal boot ROM executes as shown in Figure 3.4.2.
Regardless of the downloading method used, the boot program downloads a user program
into the internal RAM and then branc hes to the interna l RAM. Figure 3.4.3 shows how the
boot program uses the i n ternal RAM (comm on to all the downloading methods).
Note 1: To download a user program via USB, a USB device driver and special application software are needed on
the PC.
Note 2: To download a user program via UART, special application software is needed on the PC.
Note 3: The (a), (b) in the above f lowchart indicate points where the settings of exte rnal port pins are changed. Fo r
details, see Table 3.4.3.
Figure 3.4.2 Flowchart for Internal Boot ROM Operation
Start
Branch to internal RAM
3000h
Yes
Clock setting
• fSYS = fOSCH
• fUSB = fOSCH × 24/5
(a)
UART
check
No
Yes
Download via UART
USB
check
Yes
Download via
USB
No
(b)
RESUME check
PMCCTL<PCM
_
ON>=1
Branch to internal RAM
46000h
No