HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 527

• 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

Table 20.17
12 V applied
to FV
12 V not applied
to FV
2. When a flash memory control register is accessed in mode 2 (expanded mode with on-chip
3. To check for 12 V application/non-application in mode 3 (single-chip mode)
Table 20.17 shows the area accessed for the above addresses in each mode, when 12 V is and
is not applied to FV
ROM enabled)
When a flash memory control register is accessed in mode 2, it can be read or written to if 12
V is being applied to FV
essential to confirm that 12 V is being applied to the FV
When address H'FF80 is accessed in mode 3, if 12 V is being applied to FV
read/written to, and its initial value after reset is H'80. When 12 V is not being applied to FV
FLMCR is a reserved area that cannot be modified and always reads H'FF. Since bit 7
(corresponding to the V
FV
of this bit. A byte data comparison is necessary to check whether 12V is being applied. The
relevant coding is shown below.
LABEL1:
Sample program for detection of 12 V application to FV
PP
PP
PP
, application or release of 12 V to FV
Area Accessed in Each Mode with 12V Applied and Not Applied to FV
MOV.B
CMP.B
BEQ
PP
Mode 1
Reserved area
(always H'FF)
External address
space
.
PP
.
.
.
.
.
.
PP
bit) is set to 1 at this time regardless of whether 12 V is applied to
, but if not, external address space will be accessed. It is therefore
@H'FF80, R1L
#H'FF,
LABEL1
R1L
Mode 2
Flash memory control
register (initial value H'80)
External address space
PP
cannot be determined simply from the 0 or 1 status
PP
PP
pin before accessing these registers.
(mode 3)
Mode 3
Flash memory control
register (initial value
H'80)
Reserved area
(always H'FF)
PP
, FLMCR is
PP
495
PP
,