29
MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Program counter (PC)..............................................................0
Address 0 in page 0 is set to program counter.
Interrupt enable flag (INTE) ...................................................................................
Power down flag (P)...............................................................................................
External 0 interrupt request flag (EXF0)................................................................
Interrupt control register V1 ...................................................................................
Interrupt control register V2 ...................................................................................
Interrupt control register I1 ..................................................................0
Timer 1 interrupt request flag (T1F) ......................................................................
Timer 2 interrupt request flag (T2F) ......................................................................
Timer 3 interrupt request flag (T3F) ......................................................................
Watchdog timer flags (WDF1, WDF2) ...................................................................
Watchdog timer enable flag (WEF) .......................................................................
Timer control register W1 ....................................................................0
Timer control register W2 ......................................................................................
Timer control register W3 ......................................................................................
Timer count value store register W5 ...............................................................0
Clock control register MR ......................................................................................
8-bit general-purpose register SI .................................0
Carrier wave output control register C2...........................................................0
Key-on wakeup control register K0 .......................................................................
Pull-up control register PU0...................................................................................
Carry flag (CY) .......................................................................................................
Register A ..............................................................................................................
Register B ..............................................................................................................
Register D ..............................................................................................................
Register E ..............................................................................................................
Register X ..............................................................................................................
Register Y ............................................................................................0
Register Z...............................................................................................................
Stack pointer (SP)..................................................................................................
(2) Internal state at reset
Table 12 shows port state at reset, and Figure 26 shows
internal state at reset (they are retained after system is
released from reset).
Name
D
0
–D
8
, D
9
/T
OUT
P0
0
–P0
3
P1
0
–P1
3
P2
0
, P2
1
/INT
P3
0
–P3
3
P4
0
–P4
3
CARR
Notes 1: Output latch is set to “1.”
2: The pull-up transistor is turned off.
State
High impedance (Note 1)
“H” (V
DD
) level (Note 1)
High impedance
High impedance (Note 1)
High impedance (Note 2)
“L” (V
SS
) level
Function
D
0
–D
8
, D
9
P0
0
–P0
3
P1
0
–P1
3
P2
0
, P2
1
P3
0
–P3
3
P4
0
–P4
3
CARR
Table 12 Port state at reset
The contents of timers, registers, flags and RAM except those
shown in Figure 26 are undefined, so set the initial values to
them.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
“
” represents undefined.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(Interrupt disabled)
0
0
0
0
0
0
0
0
(Interrupt disabled)
(Interrupt disabled)
0
0
0
0
0
0
0
0
0
0
(Prescaler and timer 1 stopped)
(Timer 2 stopped)
(Timer 3 stopped)
1
0
0
0
0
0
0
0
0
0
1