
HARDWARE
1-44
7540 Group User
’
s Manual
Fig. 45 Internal status of microcomputer at reset
Prescaler 1
Timer 1
One-shot start register
Timer X mode register
Prescaler X
Timer X
Timer count source set register
Serial I/O2 control register
A-D control register
MISRG
Watchdog timer control register
Interrupt edge selection register
CPU mode register
Interrupt request register 1
Interrupt control register 1
Processor status register
Program counter
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
Contents of address FFFC
16
(PC
H
)
(PC
L
)
FF
16
01
16
00
16
00
16
FF
16
FF
16
00
16
00
16
10
16
00
16
0028
16
0029
16
002A
16
002B
16
002C
16
002D
16
002E
16
0030
16
0034
16
0038
16
0039
16
003A
16
003B
16
003C
16
003E
16
(PS)
Note X :
Undefined
Contents of address FFFD
16
0
0
1
1
1
1
1
1
00
16
00
16
00
16
1
0
0
0
0
0
0
0
X
X
X
X
X
1
X
X
Port P0 direction register
Port P1 direction register
Port P2 direction register
Port P3 direction register
Pull-up control register
(1)
(2)
(3)
(4)
(5)
Register contents
00
16
00
16
00
16
00
16
0001
16
0003
16
0005
16
0007
16
0016
16
Serial I/O1 control register
UART control register
(8)
(9)
Serial I/O1 status register
(7)
001A
16
001B
16
00
16
1
1
1
0
0
0
0
0
0019
16
1
0
0
0
0
0
0
0
X
X
X
0
0
0
0
0
Address
Port P1P3 control register
(6)
0017
16
00
16
Timer A mode register
Timer A (low-order)
Timer A (high-order)
00
16
FF
16
FF
16
001D
16
001E
16
001F
16
Timer Y, Z mode register
Prescaler Y
Timer Y secondary
00
16
FF
16
FF
16
0020
16
0021
16
0022
16
Timer Y primary
Timer Y, Z waveform output control register
Prescaler Z
FF
16
00
16
FF
16
0023
16
0024
16
0025
16
Timer Z secondary
FF
16
0026
16
Timer Z primary
FF
16
0027
16
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(36)
Serial I/O2 register
00
16
0031
16
Interrupt request register 2
003D
16
00
16
Interrupt control register 2
003F
16
00
16
(37)
(38)
(39)
(40)
FUNCTIONAL DESCRIPTION