Uart - Hitachi SH7760 Solution Engine2 Overview

5.3 UART

5.3.1 Block Description
Figure 5.4 shows the UART control block. As shown in Figure 5.4, the UART control block contains a
controller (ST16C2550 from EXAR), RS232C interface driver and 15-pin connector (CN1). This controller
uses the clock pulses (7.3728MHz) supplied from the power supply controller (H8/3048F-ONE) for operations,
and determines a baud rate (transfer rate) using these pulses as reference.
This controller has been provided with a 2-channel UART device. Channel A is used to communicate with the
power supply controller (H8/3048F-ONE). Because channel B is connected to a 15-pin RS-232C connector
(CN1), it can be used as a debug interface if it is connected to a PC.
In addition, channel A (INTA) inputs the controller interrupts to the SH7760 IRL9 and channel B (INTB) inputs
them to the SH7760 IRL11.
For more details, refer to EXAR's ST16C2550 Manual.
EXAR Homepage: http://www.exar.com
SH7760
/IRL3
/IRL2
/IRL1
/IRL0
Serial controller
(ST16C2550)
Address bus
Data bus
Control signal
INTB
FPGA
INTA
Figure 5.4 Serial Interface Block
RS-232C I/F driver
Chanel B
(SP3223ECY)
Power supply controller
(H8/3048F-ONE)
Chanel B
XTAL
7.3728MHz
OSC2
35
SCI chanel 1
CK
EXTAL
15 pin
Serial connector
(CN1)