4518 Datasheet, PDF (6/160 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4518 Group
MULTIFUNCTION
Pin
Multifunction
D6
CNTR0
D7
CNTR1
P20
SCK
P21
SOUT
P22
SIN
P30
INT0
P31
INT1
Pin
CNTR0
CNTR1
SCK
SOUT
SIN
INT0
INT1
Multifunction
D6
D7
P20
P21
P22
P30
P31
Pin
P60
P61
P62
P63
Multifunction
AIN0
AIN1
AIN2
AIN3
Notes 1: Pins except above have just single function.
2: The input/output of P30 and P31 can be used even when INT0 and INT1 are selected.
3: The input of ports P20–P22 can be used even when SIN, SOUT and SCK are selected.
4: The input/output of D6 can be used even when CNTR0 (input) is selected.
5: The input of D6 can be used even when CNTR0 (output) is selected.
6: The input/output of D7 can be used even when CNTR1 (input) is selected.
7: The input of D7 can be used even when CNTR1 (output) is selected.
Pin
AIN0
AIN1
AIN2
AIN3
Multifunction
P60
P61
P62
P63
DEFINITION OF CLOCK AND CYCLE
q Operation source clock
The operation source clock is the source clock to operate this
product. In this product, the following clocks are used.
• Clock (f(XIN)) by the external ceramic resonator
• Clock (f(XIN)) by the external RC oscillation
• Clock (f(XIN)) by the external input
• Clock (f(RING)) of the on-chip oscillator which is the internal
oscillator
• Clock (f(XIN)) by the external quartz-crystal oscillation
Table Selection of system clock
Register MR
System clock
MR3 MR2 MR1 MR0
0
0
0
0 f(STCK) = f(XIN)
✕
1 f(STCK) = f(RING)
0
1
0
0 f(STCK) = f(XIN)/2
✕
1 f(STCK) = f(RING)/2
1
0
0
0 f(STCK) = f(XIN)/4
✕
1 f(STCK) = f(RING)/4
1
1
0
0 f(STCK) = f(XIN)/8
✕
1 f(STCK) = f(RING)/8
✕: 0 or 1
Note: The f(RING)/8 is selected after system is released from reset.
When on-chip oscillator clock is selected for main clock, set
the on-chip oscillator to be operating state.
q System clock (STCK)
The system clock is the basic clock for controlling this product.
The system clock is selected by the clock control register MR
shown as the table below.
q Instruction clock (INSTCK)
The instruction clock is the basic clock for controlling CPU. The
instruction clock (INSTCK) is a signal derived by dividing the
system clock (STCK) by 3. The one instruction clock cycle gen-
erates the one machine cycle.
q Machine cycle
The machine cycle is the standard cycle required to execute the
instruction.
Operation mode
XIN through mode
Ring through mode
XIN divided by 2 mode
Ring divided by 2 mode
XIN divided by 4 mode
Ring divided by 4 mode
XIN divided by 8 mode
Ring divided by 8 mode
Rev.3.01 2005.06.15 page 6 of 157
REJ03B0008-0301