HD64570 Datasheet, PDF (69/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Table 2.8 Interrupt Lines
Pin Number
Input/
Output
Symbol CP-84
FP-88
Description
INT
75
2
INTA
76
3
Input/
output
(Open
drain)
Input
Interrupt request: used to request an interrupt.
The SCA drives INT active low when it has an
interrupt request.
Note: Be sure to pull this line up to V_CC.
Interrupt acknowledge: Used to acknowledge
an interrupt. The SCA recognizes an interrupt
acknowledge cycle when INTA goes active low.
Note: If no signal is input on this line in non-acknowledge mode, pull this line up to V_CC.
Table 2.9 Serial I/O (MSCI) Lines
There are two sets of serial I/O lines, for channels 0 and 1 respectively. The functions of both
channels are the same (table 2.9).
Pin Number
Symbol CP-84
TXD0, 72, 62
TXD1
RXD0, 69, 59
RXD1
TXC0, 71, 61
TXC1
FP-88
86, 76
83, 73
85, 75
RXC0, 70, 60 84, 74
RXC1
Input/
Output
Description
Output Transmit data for MSCI: outputs transmit data from the
MSCI.TXD1
Input Receive data for MSCI: inputs receive data to the
MSCI.RXD1
Input/
output
Input/
output
Transmit clock for MSCI: inputs or outputs the MSCI
transmit clock. It has three programmable modes:
Input: • External transmit clock
Output: • Transmit clock from the onchip baud rate
generator
• Receive clock
(used as the transmit clock)
Receive clock for MSCI: inputs or outputs the MSCI
receive clock. This line can also be used to input the
ADPLL operating clock. It has four programmable modes:
Input: • External receive clock
• ADPLL operating clock
Output: • Receive clock extracted by the ADPLL (when
the on-chip baud rate generator is used as the
ADPLL operating clock)
• Receive clock from the on-chip baud rate
generator
Rev. 0, 07/98, page 53 of 453