4513_03 Datasheet, PDF (109/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.1 I/O pins
(4) Direction register FR0 (The 4513 Group does not have this register.)
Register FR0 is used to switch to input/output of P50–P53.
Set the contents of this register through register A with the TFR0A instruction.
Table 2.1.4 shows the direction register FR0.
Table 2.1.4 Direction register FR0
Direction register FR0 (Note 2)
at reset : 00002 at RAM back-up : state retained W
FR03
0
Port P53 input/output control bit
Port P53 input
1 Port P53 output
0 Port P52 input
FR02 Port P52 input/output control bit
1 Port P52 output
FR01
0
Port P51 input/output control bit
Port P51 input
1 Port P51 output
0 Port P50 input
FR00 Port P50 input/output control bit
1 Port P50 output
Notes 1: “W” represents write enabled.
2: The 4513 Group does not have register FR0.
(5) Timer control register W6
D6/CNTR0 function selection bit is assigned to bit 0, D7/CNTR1 function selection bit is assigned to
bit 2.
Set the contents of this register through register A with the TW6A instruction.
The contents of register W6 is transferred to register A with the TAW6 instruction.
Table 2.1.5 shows the timer control register W6.
Table 2.1.5 Timer control register W6
Timer control register W6
at reset : 00002 at RAM back-up : state retained R/W
W63 CNTR1 output control bit
0 Timer 3 underflow signal output divided by 2
1 CNTR1 output control by timer 4 underflow signal divided by 2
W62
0 D7(I/O)/CNTR1 input
D7/CNTR1 function selection bit
1 CNTR1 I/O/D7 (input)
W61 CNTR0 output control bit
0 Timer 1 underflow signal output divided by 2
1 CNTR0 output control by timer 2 underflow signal divided by 2
0 D6 (I/O)/CNTR0 input
W60 D6/CNTR0 function selection bit
1 CNTR0 I/O/D6 (input)
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: When setting ports, W63 and W61 are not used.
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4513/4514 Group User’s Manual