PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 184

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

Data Sheet
Figure 13-1 Bootstrap Loader Sequence
After reset, the microcontroller expects the serial reception of a zero byte (8 data bits =
00
timer T6, which runs at maximum speed. The result T6 depends on the baud rate BR
and the CPU clock frequency f
Factor 9 results from zero byte duration including start bit, factor 4 from T6 prescaler.
Using T6, the bootstrap loader software calculates the optimum combination of
• FDV = value of the Fractional Divider Register S0FDV
• BG = Reload value for the Baud rate Timer / Reload Register S0BG
For this purpose, the software modifies FDV in a loop and calculates BG.
As described in Chapter 15, the baud rate is given by:
Thus, BG can be calculated from equation 1 and 2 in the following way:
CSP:IP
H
1)
2)
3)
4)
5)
6)
RSTIN
, one stop bit, no parity) from a host at pin RXD (P3.11). The time is measured by
P0L.4
RxD0
TxD0
BSL initialization time, > 2 s @ f
Zero byte (1 start bit, eight ‘0’ data bits, 1 stop bit), sent by host.
Identification byte, sent by INCA-D.
32 bytes of code / data, sent by host.
Caution: TxD0 is only driven a certain time after reception of the zero byte
Internal Boot ROM.
T6 = 9 * f
BR = FDV * f
BG = (T6 * FDV * 4) / (9*512*16) - 1 = (T6 * FDV - 18432) / 18432
CPU
1)
CPU
/ (4*BR)
6)
2)
/ (512*16*(BG+1))
CPU
CPU
5)
= 20 MHz.
Int. Boot ROM BSL-routine
.
3)
184
4)
.
The Bootstrap Loader
user software
32 bytes
PSB 21473
2003-03-31
INCA-D
(1)
(2)
(3)