upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 111

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upd70f3422gj-gae-qs-ax

Manufacturer Part Number
upd70f3422gj-gae-qs-ax
Description
32-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
CPU System Functions
Table 3-7
Caution
Note
(4)
EIPSW, FEPSW, DBPSW, CTPSWPSW saving registers
The PSW saving registers save the contents of the program status word for
different occasions, see Table 3-4.
When one of the occasions listed in Table 3-4 occurs, the current value of the
PSW is saved to the saving registers.
All PSW saving registers are built up as the PSW, with the initial value
0000 0xxx
PSW saving registers
When multiple interrupt servicing is enabled, the contents of EIPSW or
FEPSW must be saved by program—because only one PSW saving register
for maskable interrupts and non-maskable interrupts is provided, respectively.
Bits 31 to 26 of EIPC and bits 31 to 12 and 10 to 8 of EIPSW are reserved for
future function expansion (fixed to 0).When setting the value of EIPC, FEPC, or
CTPC, use even values (bit 0 = 0).
If bit 0 is set to 1, the setting of this bit is ignored. This is because bit 0 of the
program counter is fixed to 0.
Preliminary User’s Manual U17566EE1V2UM00
a)
Register
Status saving register
during interrupt
Status saving register
during non-maskable
interrupts
Status saving register
during exception/debug
trap
Status saving register
during CALLT execution
Reading from this register is only enabled between a DBTRAP exception (excep-
tion handler address 0000 0060
instruction. DBTRAP exceptions are generated upon ILGOP and ROM Correction
detections (refer to “Interrupt Controller (INTC)“ on page 187 and “ROM Correction
Function (ROMC)“ on page 331).
H
(x = undefined).
Shortcut Saves contents of PSW in case of
EIPSW
FEPSW
DBPSW
CTPSW
H
) and the exception handler terminating DBRET
a
• software exception
• maskable interrupt
• non-maskable interrupt
• exception trap
• debug trap
• debug break
• during a single-step operation
• execution of CALLT instruction
Chapter 3
111

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