SH7144 Datasheet, PDF (83/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

Section 3 MCU Operating Modes
3.1 Selection of Operating Modes
This LSI has four operating modes and four clock modes. The operating mode is determined by
the setting of MD3 to MD0, and FWP pins. Do not change these pins during LSI operation (while
power is on). Do not set these pins in the other way than the combination shown in table 3.1.
When power is applied to the system, be sure to conduct power-on reset.
Table 3.1 Selection of Operating Modes
Mode
Pin Setting
No. FWP MD3*¹ MD2*¹ MD1 MD0 Mode Name
Bus Width of
CS0 Area
On-Chip ROM SH7144 SH7145
Mode 0 1 x
x
0 0 MCU
Not Active
8 bits 16 bits
extension
mode 0
Mode 1 1 x
x
0 1 MCU
Not Active
16 bits 32 bits
extension
mode 1
Mode 2 1 x
x
1 0 MCU
Active
extension
mode 2
Set by BCR1 of
BSC
Mode 3 1 x
x
1 1 Single chip Active
mode
*²
0x
x
0 0 Boot mode*² Active
*²
0x
x
01
*²
0x
x
1 0 User
Active
programming
*²
0x
x
1
1
mode*²

Set by BCR1 of
BSC

Set by BCR1 of
BSC
—
Notes: The symbol x means “Don’t care.”
1. MD3 and MD2 pins are used to select clock mode.
2. User programming mode for flash memory. Supported in only F-ZTAT version.
There are two modes as the MCU operating modes: MCU extension mode and single chip mode.
There are two modes to program the flash memory (on-board programming mode): boot mode and
user programming mode.
Rev. 2.0, 09/02, page 43 of 732