HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 484

• 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

Notes on Use of Boot Mode
1. When the H8/3437F comes out of reset in boot mode, it measures the low period of the input at
2. In boot mode, if any data has been programmed into the flash memory (if all data
3. Interrupts cannot be used while the flash memory is being programmed or erased.
4. The RxD
5. Before branching to the user program (at address H'F7E0 in the RAM area), the H8/3437F
6. Boot mode can be entered by starting from a reset after 12 V is applied to the MD
452
the SCI’s RxD
100 states for the H8/3437F to get ready to measure the low period of the RxD
H'FF), all flash memory blocks are erased. Boot mode is for use when user programming mode
is unavailable, e.g. the first time on-board programming is performed, or if the update program
activated in user programming mode is accidentally erased.
terminates transmit and receive operations by the on-chip SCI (by clearing the RE and TE bits
of the serial control register to 0 in channel 1), but the auto-aligned bit rate remains set in bit
rate register BRR. The transmit data output pin (TxD
bits P8
to 1).
At this time, the values of general registers in the CPU are undetermined. Thus these registers
should be initialized immediately after branching to the user program. Especially in the case of
the stack pointer, which is used implicitly in subroutine calls, the stack area used by the user
program should be specified.
There are no other changes to the initialized values of other registers.
pins according to the mode setting conditions listed in table 20.7. Note the following points
when turning the V
When reset is released (at the rise from low to high), the H8/3437F checks for 12-V input at
the MD
status internally. The threshold point of this voltage-level check is in the range from
approximately V
insufficient for programming or erasure (11.4 V to 12.6 V). When the boot program is
executed, the V
12.6 V before the branch to the RAM area occurs. See figure 20.20.
Make sure that the programming voltage V
boot mode (at the reset release timing) and does not go outside the range of 12 V 0.6 V while
in boot mode. Boot mode will not be executed correctly if these limits are exceeded. In
4
1
DDR of the port 8 data direction register and P8
and FV
1
and TxD
1
PP
pin. The reset should end with RxD
PP
CC
power supply must therefore be stabilized within the range of 11.4 V to
pins. If it detects that these pins are programmed for boot mode, it saves that
PP
1
+ 2 V to 11.4 V, so boot mode will be entered even if the applied voltage is
pins should be pulled up on-board.
power on.
PP
does not exceed 12.6 V during the transition to
1
high. After the reset ends, it takes about
1
) is in the high output state (in port 8, the
4
DR of the port 8 data register are set
1
input.
*3
1
and FV
is not
PP