Renesas H8S/2111B 用户手册

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页码 582
Rev. 1.00, 05/04, page 441 of 544 
 
18.6 Operating 
Modes 
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. 
In normal mode (mode 3), up to 56 Kbytes of ROM can be used. 
Table 18.3  Operating Modes and ROM 
Operating Modes 
Mode Pins
MCU  
Operating Mode 
CPU  
Operating Mode  Mode 
MD1 
MD0 On-Chip ROM 
Mode 2 
Advanced 
Single-chip mode 1 
Enabled (64 Kbytes) 
Mode 3 
Normal 
Single-chip mode 1 
Enabled (56 Kbytes) 
 
18.7 
On-Board Programming Modes 
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 18.4 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 18.2. 
Table 18.4  On-Board Programming Mode Settings 
Mode 
Setting 
MD1 MD0 P92 P91 P90 
Boot mode 
1* 
1* 
1* 
Mode 2 (advanced mode)  1 
 
 
 
User program mode 
Mode 3 (normal mode) 
 
 
 
Note:  *  Can be used as an I/O port after the boot mode activation.