DF61657CN35FTV Renesas Electronics America, DF61657CN35FTV Datasheet - Page 738

• Manufacturer Part Number: DF61657CN35FTV
• Description: IC H8SX/1657 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61657CN35FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 35MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 82
• Program Memory Size: 768KB (768K x 8)
• Program Memory Type: FLASH
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: 3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 18 Flash Memory (0.18-µm F-ZTAT Version)
18.11
It is possible to switch between the user MAT and user boot MAT. However, the following
procedure is required because the start addresses of these MATs are allocated to the same address.
Switching to the user boot MAT disables programming and erasing. Programming of the user boot
MAT should take place in boot mode or programmer mode.
1. Memory MAT switching by FMATS should always be executed from the on-chip RAM.
2. When accessing the memory MAT immediately after switching the memory MATs by
3. If an interrupt request has occurred during memory MAT switching, there is no guarantee of
4. After the memory MATs have been switched, take care because the interrupt vector table will
5. The size of the user MAT is different from that of the user boot MAT. Addresses which exceed
Rev. 2.00 Jun. 28, 2007 Page 712 of 864
REJ09B0341-0200
FMATS from the on-chip RAM, similarly execute the NOP instruction in the on-chip RAM
for eight times (this prevents access to the flash memory during memory MAT switching).
which memory MAT is accessed. Always mask the maskable interrupts before switching
memory MATs. In addition, configure the system so that NMI interrupts do not occur during
memory MAT switching.
also have been switched. If interrupt processing is to be the same before and after memory
MAT switching, transfer the interrupt processing routines to the on-chip RAM and specify
VBR to place the interrupt vector table in the on-chip RAM.
the size of the 8-kbyte user boot MAT should not be accessed. If an attempt is made, data is
read as an undefined value.
<User MAT>
Switching between User MAT and User Boot MAT
Figure 18.22 Switching between User MAT and User Boot MAT
Procedure for switching to the user boot MAT
1.
2.
3.
Procedure for switching to the user MAT
1.
2.
3.
Inhibit interrupts (mask).
Write H'AA to FMATS.
Before access to the user boot MAT, execute the NOP instruction for eight times.
Inhibit interrupts (mask).
Write other than H'AA to FMATS.
Before access to the user MAT, execute the NOP instruction for eight times.
<On-chip RAM>
Procedure for
switching to
user boot MAT
Procedure for
switching to
user MAT
<User boot MAT>