HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 536

• 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

Bits 1 and 0—Mode Select 1 and 0 (MDS1, MDS0): These bits indicate the input levels at mode
pins MD
and MD
pin (MD
21.1.7
Mode Transition Diagram: When the mode pins are set in the reset state and a reset start is
effected, the microcontroller enters one of the operating modes as shown in figure 21.2. In user
mode, the flash memory can be read but cannot be programmed or erased.
Modes in which the flash memory can be programmed and erased are boot mode, user
programming mode, and writer mode.
504
Notes: Transitions between user mode and user programming mode should only be made when the CPU is
FLSHE = 1
*1 MD
*2 MD
not accessing the flash memory.
0
with on-chip ROM
1
1
, respectively. MDS1 and MDS0 are read-only bits, and cannot be modified. The mode
Flash Memory Operating Modes
and MD
and MD
User mode
enabled
0
0
= MD
= MD
0
0
On-board programming mode
) input levels are latched into these bits when MDCR is read.
(the current operating mode). Bits MDS1 and MDS0 correspond to pins MD
1
1
FLSHE = 0
programming
Figure 21.2 Flash Memory Related State Transitions
= 0, P92 = P91 = P90 = 1
= 0, P92 = 0, P91 = P90 = 1
mode
User
MD
1
= 1
RES = 0
RES = 0
Reset state
Boot mode
*1
RES = 0
*2
RES = 0
Writer mode
1