Datasheet

Section 3 MCU Operating Modes
Rev.6.00 Sep. 27, 2007 Page 77 of 1268
REJ09B0220-0600
Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection (H8S/2328B F-ZTAT, H8S/2326 F-ZTAT)
The H8S/2328B F-ZTAT and H8S/2326 F-ZTAT have eight operating modes (modes 4 to 7, 10,
11, 14 and 15). These modes are determined by the mode pin (MD
2
to MD
0
) and flash write enable
pin (FWE) settings. The CPU operating mode and initial bus width can be selected as shown in
table 3.1.
Table 3.1 lists the MCU operating modes.
Table 3.1 MCU Operating Mode Selection (H8S/2328B F-ZTAT, H8S/2326 F-ZTAT)
External Data
Bus
MCU
Operating
Mode FWE MD
2
MD
1
MD
0
CPU
Operating
Mode Description
On-Chip
ROM
Initial
Value
Max
Value
1 0 0 0 1 — — — — —
2 1 0
3 1
4 1 0 0 Advanced Disabled 16 bits 16 bits
5 1
Expanded mode with
on-chip ROM disabled
8 bits 16 bits
6 1 0 Expanded mode with on-
chip ROM enabled
Enabled 8 bits 16 bits
7 1 Single-chip mode — —
8 1 0 0 0 — — — — —
9 1
10 1 0 Advanced Boot mode Enabled 8 bits 16 bits
11 1 — —
12 1 0 0 — — — — —
13 1
14 1 0 Advanced User program mode Enabled 8 bits 16 bits
15 1 — —