4570 Datasheet, PDF (22/69 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
System clock
Instruction clock
W13 (Note 1)
Prescaler
W12
MR3
0
1/4
0
XIN
0
Frequency
1
Internal clock generating
circuit (divided by 3)
1
1/8
1
dividing circuit
(divided by 4)
CARRY
W11
0
1
W10(Note 1)
0
1
Timer 1(10)
ORCLK
(TAB1)
Reload register R1 (10)
(T1AB) (Note 2)
(TAB1)
Register W5 Register B Register A
T1F
Timer 1
interrupt
W21,W20
00
01
10
11
W23(Note 1)
0
1
Timer 1 underflow signal
Timer 2 (8)
(TAB2)
Reload register R2 (8)
T
(TR2AB) T
2
2
A
A
B
B
Register B Register A
(TAB2)
Timer 2 underflow signal
Register B Register A
(T3HAB)
Reload register R3H (8)
W31,W30
00
W33(Note1)
Reload control circuit
01
0
MR3
10
1
0
11
1/2
1
Not available
Timer 3(8)
(T3AB)
Reload register R3L (8)
TQ
R
W33
(TAB3)
(T3AB)
Register B Register A
(TAB3)
16-bit timer underflow signal
Instruction clock
16-bit timer (WDT)
1
15 16
WRST instruction
Reset signal
S
WEF _Q
R
WDF1 WDF2
T2F
Timer 2
interrupt
CARRY
(to timer 1/port CARR)
T3F
Timer 3
interrupt
System reset
D9/TOUT
W22
0
1
D9 output
1/2
Timer 2 underflow signal
Fig. 19 Timers structure
Notes 1: Count source is stopped by setting to “0.”
2: When the T1AB instruction is executed after
setting W10 to “1,” data is only written to reload
register R1.
21