h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 671

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

23.6
The flash memory is connected to the CPU via a 16-bit data bus, enabling byte data and word data
to be accessed in a single state. Even addresses are connected to the upper 8 bits and odd addresses
are connected to the lower 8 bits. Note that word data must start from an even address.
On-chip ROM is enabled or disabled by the mode select pins (MD1 and MD0) and the EXPE bit
in MDCR, as summarized in table 23.3.
In normal mode (mode 3), up to 56 kbytes of ROM can be used.
Table 23.3 Operating Modes and ROM
23.7
An on-board programming mode is used to perform on-chip flash memory programming, erasing,
and verification. This LSI has two on-board programming modes: boot mode and user program
mode. Table 23.4 shows pin settings for boot mode. In user program mode, operation by software
is enabled by setting control bits. For details on flash memory mode transitions, see figure 23.2.
MCU
Operating
Mode
Mode 1
Mode 2
Mode 3
Operating Modes
On-Board Programming Modes
CPU
Operating
Mode
Normal
Advanced
Advanced
Normal
Normal
Operating Modes
Mode
Expanded mode with
on-chip ROM disabled
Single-chip mode
Expanded mode with
on-chip ROM enabled
Single-chip mode
Expanded mode with
on-chip ROM enabled
Rev. 3.00 Mar 21, 2006 page 617 of 788
MD1
0
1
1
1
1
Mode Pins
MD0
1
0
0
1
1
MDCR
EXPE
1
0
1
0
1
REJ09B0300-0300
Section 23 ROM
On-Chip
ROM
Disabled
Enabled
(64/128/25
6 kbytes)
Enabled
(56 kbytes)