III PERIPHERAL BLOCK: 16-BIT PROGRAMMABLE TIMERS

A-1

CFP16–CFP10: P1[6:0] pin function selection (D[6:0]) / P1 function select register (0x402D4)

Selects the pin to be used for input of an external count clock to the timer.

Write "1": Clock input pin

Write "0": I/O port pin

Read: Valid

Select clock input pins for the timers that are used as an event counter from among P10 through P16, by writing "1" to CFP10–CFP16. For the relationship between each pin and timer, refer to Table 4.1. The pin is set for an I/O port by writing "0" to CFP1x.

In addition to pin selection here, the pin to be used for clock input to the 16-bit programmable timer must be set to input mode using the I/O control register.

At cold start, CFP1x is set to "0" (I/O port). At hot start, CFP1x retains its status from prior to the initial reset.

CFP27–CFP22: P2[7:2] pin function selection (D[7:2]) / P2 function select register (0x402D8)

Selects the pin used for clock output.

Write "1": Clock output pin

Write "0": I/O port pin

Read: Valid

Select the pin to be used to output a timer-generated clock to external devices from among P22 through P27, by writing "1" to CFP22–CFP27. For the relationship between each pin and timer, refer to Table 4.1. The pin is set for an I/O port by writing "0" to CFP2x.

At cold start, CFP2x is set to "0" (I/O port). At hot start, CFP2x retains its status from prior to the initial reset.

CFEX1: P10, P11, P13 port extended function (D1) / Port function extension register (0x402DF)

CFEX0: P12, P14 port extended function (D0) / Port function extension register (0x402DF)

Sets whether the function of an I/O-port pin is to be extended.

Write "1":

Function-extended pin

Write "0":

I/O-port/peripheral-circuit pin

Read:

Valid

When CFEX[1:0] is set to "1", the P14–P10 ports function as debug signal output ports. When CFEX[1:0] = "0", the CFP1[4:0] bit becomes effective, so the settings of these bits determine whether the P14–P10 ports function as I/O port s or external clock input ports.

At cold start, CFEX[1:0] is set to "1" (function-extended pins). At hot start, CFEX[1:0] retains its state from prior to the initial reset.

IOC16–IOC10: P1[6:0] port I/O control (D[6:0]) / P1 I/O control register (0x402D6)

Directs P10 through P16 for input or output and indicates the I/O control signal value of the port.

When writing data

Write "1": Output mode

Write "0": Input mode

For the pin selected from among P10 through P16 for use for external clock input, write "0" to the corresponding I/O control bit to set it to input mode. If the pin is set to output mode, even though its CFP1x may be set to "1", it functions as the output pin of an 8-bit programmable timer and cannot be used to receive an external clock.

When reading data

Read "1": I/O control signal (output)

Read "0": I/O control signal (input)

The I/O control signal value for the port pin is read from this register. When I/O port function is selected using the CFEX and CFP1x registers, the value written to the IOC register is read out as is. When peripheral function is selected, the read value depends on the peripheral circuit status and may not indicate the value written to the IOC register.

At cold start, IOC1x is set to "0" (input mode). At hot start, the bit retains its state from prior to the initial reset.

B-III

16TM

S1C33L03 FUNCTION PART

EPSON

B-III-4-19