HD64F3642AH Renesas Electronics America, HD64F3642AH Datasheet - Page 100

• Manufacturer Part Number: HD64F3642AH
• Description: IC H8 MCU FLASH 16K 64QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Lr

Specifications of HD64F3642AH

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 3 Exception Handling
3.4
3.4.1
When word data is accessed in the H8/3644 Group, the least significant bit of the address is
regarded as 0. Access to the stack always takes place in word size, so the stack pointer (SP: R7)
should never indicate an odd address. Use PUSH Rn (MOV.W Rn, @–SP) or POP Rn (MOV.W
@SP+, Rn) to save or restore register values.
Setting an odd address in SP may cause a program to crash. An example is shown in figure 3.6.
When CCR contents are saved to the stack during interrupt exception handling or restored when
RTE is executed, this also takes place in word size. Both the upper and lower bytes of word data
are saved to the stack; on return, the even address contents are restored to CCR while the odd
address contents are ignored.
Rev. 6.00 Sep 12, 2006 page 78 of 526
REJ09B0326-0600
Legend:
PC
PC
R1L:
SP:
H
L
:
:
SP
Upper byte of program counter
Lower byte of program counter
General register R1L
Stack pointer
Application Notes
Notes on Stack Area Use
SP set to H'FEFF
Figure 3.6 Operation when Odd Address Is Set in SP
BSR instruction
SP
Stack accessed beyond SP
PC
PC
H
L
MOV. B R1L, @–R7
SP
Contents of PC are lost
PC
R1L
L
H
H'FEFC
H'FEFD
H'FEFF