UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 242

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

240
The transmit/receive clock for the baud rate to be generated is obtained by dividing the system clock.
• Generating transmit/receive clock for baud rate from system clock
The transmit/receive clock is generated by dividing the system clock. The baud rate generated from the system
clock can be calculated from the following expression.
[Baud rate] =
f
m: Value set by TPS0n0 to TPS0n2 (n = 0, 1)
k: Value set by MDL0n0 to MDL0n3 (n = 0, 1) (0
Tables 12-2 and 12-3 show the relationship between the source clock of the 5-bit counter and the value of m.
Table 12-4 shows the relationship between the system clock and baud rate.
Table 12-2. Relationship Between Source Clock of 5-Bit Counter and Value of m (with UART00)
Table 12-3. Relationship Between Source Clock of 5-Bit Counter and Value of m (with UART01)
X
: System clock oscillation frequency
(1
m
Note Expanded-specification products only.
Note Expanded-specification products only.
8 for UART00, 2
2
TPS012
m + 1
TPS002
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
(k + 16)
f
X
CHAPTER 12 SERIAL INTERFACES UART00 AND UART01
TPS011 TPS010
TPS001 TPS000
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
[Hz]
m
0
1
0
1
0
1
0
1
1
0
0
1
0
1
0
1
9 for UART01)
User’s Manual U13029EJ7V1UD
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
5-Bit Counter Source Clock Selection
750 kHz
375 kHz
6 MHz
3 MHz
1.5 MHz
187 kHz
93.7 kHz
46.8 kHz
5-Bit Counter Source Clock Selection
At f
3 MHz
1.5 MHz
750 kHz
375 kHz
187 kHz
93.7 kHz
46.8 kHz
23.4 kHz
At f
X
= 12 MHz
X
= 12 MHz
k
14)
Note
Note
524 kHz
262 kHz
4.19 MHz
2.1 MHz
1.05 MHz
131 kHz
65.5 kHz
32.7 kHz
2 MHz
1 MHz
524 kHz
262 kHz
131 kHz
65.5 kHz
32.7 kHz
16.4 kHz
At f
At f
X
X
= 8.38 MHz
= 8.38 MHz
m
4
5
1
2
3
6
7
8
m
2
3
4
5
6
7
8
9