h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 112

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 3 MCU Operating Modes
3.3
3.3.1
The CPU can access a 16-Mbyte address space in advanced mode. The on-chip ROM is enabled.
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. However, because this LSI has a maximum of 18 address output pins,
an external address space can be accessed only when the I/O strobe function of the AS/IOS pin,
the CP/CF extension function, and the CS256 function are used.
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.
Rev. 3.00 Jan 25, 2006 page 60 of 872
REJ09B0286-0300
Bit
3
2
1
0
Bit Name
FLSHE
—
ICKS1
ICKS0
Mode 2
Operating Mode Descriptions
Initial Value
0
0
0
0
R/W
R/W
R/(W)
R/W
Description
Flash Memory Control Register Enable
Enables or disables CPU access for flash memory
registers (FLMCR1, FLMCR2, EBR1, EBR2), control
registers of power-down states (SBYCR, LPWRCR,
MSTPCRH, MSTPCRL), and control registers of on-
chip peripheral modules (BCR2, WSCR2, PCSR,
SYSCR2).
0: Control registers of power-down states and on-
1: Control registers of flash memory are accessed in
Reserved
The initial value should not be changed.
Internal Clock Source Select 1, 0
These bits select a clock to be input to the timer
counter (TCNT) and a count condition together with
bits CKS2 to CKS0 in the timer control register
(TCR). For details, see section 13.3.4, Timer Control
Register (TCR).
chip peripheral modules are accessed in an area
from H'(FF)FF80 to H'(FF)FF87.
an area from H'(FF)FF80 to H'(FF)FF87.