HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 632

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

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
MCU
Operating
Mode
Mode 1
Mode 2
Mode 3
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.
Table 23.4 On-Board Programming Mode Settings
Mode Setting
Boot mode
User program
mode
Note:* Can be used as an I/O port after the boot mode activation.
Rev. 2.0, 08/02, page 592 of 788
Operating Modes
On-Board Programming Modes
CPU
Operating
Mode
Normal
Advanced
Advanced
Normal
Normal
Mode 2 (advanced mode)
Mode 3 (normal mode)
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
0
1
MD1
1
MD1
0
1
1
1
1
MD0
0
0
1
Mode Pins
MD0
1
0
0
1
1
1*
P92
MDCR
EXPE
1
0
1
0
1
P91
1*
On-Chip
ROM
Disabled
Enabled
(64/128/256
kbytes)
Enabled
(56 kbytes)
P90
1*