HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 224

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

5.4.2
The transmit clock sources are shown in figure 5.30. When the transmit baud rate generator
output serves as the transmit clock, the TXC line functions as the transmit clock output line.
The receive clock is used as the transmit clock when the clock is extracted by the ADPLL or is in
bit synchronous loop mode.
In asynchronous mode, the actual bit rate is determined by the clock mode (1/1, 1/16, 1/32, or
1/64). In byte or bit synchronous mode, 1/1 clock mode is automatically selected. For details, see
section 5.2.2, MSCI Mode Register 1 (MD1).
Rev. 0, 07/98, page 208 of 453
CLK
TXC line input
Receive clock
Transmit Clock Sources
generator
baud rate
Transmit
Figure 5.30 Transmit Clock Sources
f
(TMC: 1 to 256, TXBR: 0 to 9)
BRG
f
CLK
=
TMC
f
: System clock (CLK) frequency
CLK
÷ 2
f
BR
TXBR
Transmit clock
(1/1, 1/16, 1/32 or
1/64 clock mode)