Appe
ndix
Appendix
User's Manual
BAB
740
7—3
7.1.2 Enhanced Serial Communications
Controller (ESCC)
In addition to the two serial controllers COM1 and COM2 that are
incorporated in the PC97307 Super-I/O the BAB 740 features
another two serial lines that are realized with a Z85230 ESCC. The
ESCC is clocked with 12 MHz or 14.7456 MHz. This allows transfer
rates up to 3 MBaud synchronous and 230.4 KBaud asynchronous.
Channel A can be operated with DMA to reduce interrupt load of the
CPU for synchronous block protocols. DMA channel 0 is used for
receive and Channel 1 for transmit. The DMA controller must be
programmed to type A or B mode. The Interrupt request of the
ESCC is connected to INT9 input of the interrupt controller.
Table 31: ESCC Address Assignment:
I/O Address
Description
$800
ESCC Channel B Control
$801
ESCC Channel A Control
$802
ESCC Channel B Data
$803
ESCC Channel A Data
Summary of Contents for BAB 740
Page 1: ...BAB 740 Basic Automation Board with PowerPC 740 manual Revision 2C...
Page 11: ...User s Manual Table of Contents BAB 740 V 7 1 9 PCI IDSEL 7 9 7 2 Factory settable Jumpers 7 9...
Page 16: ...Table of Contents User s Manual BAB 740 X...
Page 22: ...Specification Specification User s Manual BAB 740 1 6...
Page 42: ...Connector Assignments User s Manual BAB 740 3 16 Connector Assignments...
Page 50: ...Board Parameters Board Parameters User s Manual BAB 740 4 8...
Page 60: ...Booting Booting User s Manual BAB 740 6 4...
Page 74: ...NOTES...