HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 545

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Bit 4—Flash Memory Control Register Enable (FLSHE): When the FLSHE bit is set to 1, the
flash memory control registers can be read and written to. When FLSHE is cleared to 0, the flash
memory control registers are unselected. In this case, the contents of the flash memory contents
are retained.
Bit 4: FLSHE
0
1
Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1, WMS0)
Bits 1 and 0—Wait Count 1 and 0 (WC1, WC0)
These bits control insertion of wait states by the wait-state controller. For details, see section 5,
Wait-State Controller.
21.3
When an on-board programming mode is selected, the on-chip flash memory can be programmed,
erased, and verified. There are two on-board programming modes: boot mode and user
programming mode. Table 21.6 indicates how to select the on-board programming modes. User
programming mode operation can be performed by setting control bits with software. A state
transition diagram for flash memory related modes is shown in figure 21.2.
Table 21.6 On-Board Programming Mode Selection
Mode Selection
Boot mode
User programming
mode
21.3.1
To use boot mode, a user program for programming and erasing the flash memory must be
provided in advance on the host machine (which may be a personal computer). Serial
communication interface (SCI) channel 1 is used in asynchronous mode.
When a reset state is executed after the H8/3437SF pins have been set to boot mode, the built-in
boot program is activated, and the on-board update routine provided in the host is transferred
sequentially to the H8/3437SF using the serial communication interface (SCI). The H8/3437SF
writes the on-board update routine received via the SCI to the on-board update routine area in the
on-chip RAM. After the transfer is completed, execution branches to the first address of the on-
On-Board Programming Modes
Boot Mode
Description
Flash memory control registers are in unselected state
Flash memory control registers are in selected state
MD
0
1
1
MD
0
0
1
0
P9
1
—
2
P9
1
—
1
P9
1
—
(Initial value)
0
513