III PERIPHERAL BLOCK: 16-BIT PROGRAMMABLE TIMERS
I/O Pins of 16-Bit Programmable Timers
Table 4.1 shows the input/output pins used for the 16-bit programmable timers.
Table 4.1 I/O Pins of 16-Bit Programmable Timer
Pin name | I/O | Function | Function select bit |
P10/EXCL0/ | I/O | I/O port / 16-bit timer 0 event counter input (I) / | CFP10(D0)/P1 function select register(0x402D4) |
T8UF0/DST0 | | 8-bit timer 0 output (O) / DST0 output (Ex) | CFEX1(D1)/Port function extension register(0x402DF) |
P11/EXCL1/ | I/O | I/O port / 16-bit timer 1 event counter input (I) / | CFP11(D1)/P1 function select register(0x402D4) |
T8UF1/DST1 | | 8-bit timer 1 output (O) / DST1 output (Ex) | CFEX1(D1)/Port function extension register(0x402DF) |
P12/EXCL2/ | I/O | I/O port / 16-bit timer 2 event counter input (I) / | CFP12(D2)/P1 function select register(0x402D4) |
T8UF2/DST2 | | 8-bit timer 2 output (O) / DST2 output (Ex) | CFEX0(D0)/Port function extension register(0x402DF) |
P13/EXCL3/ | I/O | I/O port / 16-bit timer 3 event counter input (I) / | CFP13(D3)/P1 function select register(0x402D4) |
T8UF3/DPCO | | 8-bit timer 3 output (O) / DPCO output (Ex) | CFEX1(D1)/Port function extension register(0x402DF) |
P15/EXCL4 | I/O | I/O port / 16-bit timer 4 event counter input (I) / | CFP15(D5)/P1 function select register(0x402D4) |
/#DMAEND0 | | High-speed DMA Ch.0 end signal output (O) | |
P16/EXCL5 | I/O | I/O port / 16-bit timer 5 event counter input (I) / | CFP16(D6)/P1 function select register(0x402D4) |
/#DMAEND1 | | High-speed DMA Ch.1 end signal output (O) | |
P22/TM0 | I/O | I/O port / 16-bit timer 0 output | CFP22(D2)/P2 function select register(0x402D8) |
P23/TM1 | I/O | I/O port / 16-bit timer 1 output | CFP23(D3)/P2 function select register(0x402D8) |
P24/TM2 | I/O | I/O port / 16-bit timer 2 output | CFP24(D4)/P2 function select register(0x402D8) |
P25/TM3 | I/O | I/O port / 16-bit timer 3 output | CFP25(D5)/P2 function select register(0x402D8) |
P26/TM4 | I/O | I/O port / 16-bit timer 4 output | CFP26(D6)/P2 function select register(0x402D8) |
P27/TM5 | I/O | I/O port / 16-bit timer 5 output | CFP27(D7)/P2 function select register(0x402D8) |
(I): Input mode, (O): Output mode, (Ex): Extended function
TMx (output pin of the 16-bit programmable timer)
This pin outputs a clock generated by the timer x.
EXCLx (event counter input pin)
When using the timer x as an event counter, input count pulses from an external source to this pin.
How to set the input/output pins of 16-bit programmable timers
All clock output pins used by the 16-bit programmable timers are shared with I/O ports. At cold start, all these pins are set for the I/O port pins P2x (function select bit CFP2x = "0"), and go into high-impedance. When using the clock output function of the 16-bit programmable timer, select the desired timer and write "1" to the function select bit CFP2x for the corresponding pin. At hot start, these pins retain their status before from prior to the reset.
All event-counter input pins are also shared with I/O-ports. At cold start, the EXCL[3:0] pins are set for debug signal output pins (function extension bit CFEX[1:0] = "1") and the EXCL[5:4] pins are set for I/O- port pins P1[5:4] (function select bit CFP1[5:4] = "0"). When using the event counter function, select the desired timer and write "1" to the function select bit CFP1x and write "0" to the function select bit CFEXx for the corresponding pin.
Note that these pins are also shared with output pins for the 8-bit programmer timers, etc. When the input/output pins are set in input mode, they function as event counter inputs. Therefore, it is necessary to set the I/O port's I/O control bit IOC1x to "0" in advance. At cold start, these pins are set in input mode. At hot start, they retain their status from prior to the reset.
