Section 3 MCU Operating Modes
Rev. 3.00 Jan 25, 2006 page 61 of 872
REJ09B0286-0300
3.3.2
Mode 3
The CPU can access a 64-kbyte address space in normal mode. The on-chip ROM is enabled. The
CPU can access a 56-kbyte address space in mode 3.
After a reset, the LSI is set to single-chip mode. To access an external address space, bit EXPE in
MDCR should be set to 1.
In extended mode, ports 1 and 2 function as input ports after a reset. Ports 1 and 2 function as an
address bus by setting 1 to the corresponding port data direction register (DDR). Port 3 functions
as a data bus, and parts of port 9 carry bus control signals. Port 6 functions as a data bus when the
ABW bit in WSCR is cleared to 0.
3.3.3
Pin Functions
Pin functions of ports 1 to 3, 6, 9, and A depend on the operating mode. Table 3.2 shows pin
functions in each operating mode.
Table 3.2
Pin Functions in Each Operating Mode
Port
Mode 2
Mode 3
Port 1
I/O port
*
/Address bus output
I/O port
*
/Address bus output
Port 2
I/O port
*
/Address bus output
I/O port
*
/Address bus output
Port 3
I/O port
*
/Data bus I/O
I/O port
*
/Data bus output
Port 6
I/O port
*
/Data bus I/O
I/O port
*
/Data bus output
Port 9
P97
I/O port
*
/Control signal output
I/O port
*
/Control signal output
P96
Input port
*
/Clock I/O
Input port
*
/Clock I/O
P95 to P93
I/O port
*
/Control signal output
I/O port
*
/Control signal output
P90
I/O port
*
/Control signal output
I/O port
*
/Control signal output
Port A
I/O port
*
/Address bus output
I/O port
*
Legend:
*
: After reset
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...