Z16C3510VSG Zilog, Z16C3510VSG Datasheet - Page 24

• Manufacturer Part Number: Z16C3510VSG
• Description: IC 10MHZ Z8500 CMOS ISCC 68-PLCC
• Manufacturer: Zilog
• Series: IUSC™r

Specifications of Z16C3510VSG

• Controller Type: Serial Communications Controller (SCC)
• Interface: USB
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 50mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Z16C35ISCC™ User’s Manual
ISCC™ DMA and Ancillary Support Circuitry
3.3 BAUD RATE GENERATOR (Continued)
The formulas relating the baud rate to the time-constant
and vice versa are shown below. The clock mode in the
formula is the ratio of the receive clock applied to the ISCC
relative to the data rate. The ISCC may be programmed to
accept a receive clock that is one, sixteen, thirty-two, or
sixty-four times the data rate (refer to the description of
WR4 and the descriptions in Chapter 4).
In these formulas, the baud rate generator clock frequency
(PCLK or /RTxC) is in Hertz, the desired baud rate in
bits/second and the time constant is dimensionless. The
example in Table 3-1 assumes a 2.4576 MHz clock (from
/RTxC) clock factor of 16 and shows the time constant for
a number of popular baud rates.
For example:
3-4
TC =
Time Constant =
Baud Rate =
2.4576 X 10
2X16 X 150
2*(Clock Mode)*(Time Constant +2)
2*(Clock Mode)*(Baud Rate)
6
Clock Frequency
= 510
Clock Frequency
- 2
Initializing the baud rate generator is done in three steps.
First, the time-constant is determined and loaded into
WR12 and WR13. Next, the processor must select the
clock source for the baud rate generator by setting bit D1
of WR14. Finally, the baud rate generator is enabled by
setting bit D0 of WR14 to “1.”
Note that the first write to WR14 is not necessary after a
hardware reset if the clock source is the /RTxC pin. This is
because a hardware reset automatically selects the /RTxC
pin as the baud rate generator clock source.
Decimal
0
2
6
14
30
62
126
254
510
Table 3-2. Baud Rates for 2.4576 MHz Clock
Time Constant
and 16x Clock Factor
Hex
0000
0002
0006
000E
001E
003E
007E
00FE
01FE
UM011001-0601
Baud Rate
38400
19200
9600
4800
2400
1200
600
300
150