Hardware manual

Rev. 3.0, 09/98, page 161 of 361
8.1.3 Input and Output Pins
Table 8.1 lists the input and output pins of the 8-bit timer.
Table 8.1 Input and Output Pins of 8-Bit Timer
Abbreviation
Name TMR0 TMR1 I/O Function
Timer output TMO
0
TMO
1
Output Output controlled by compare-match
Timer clock input TMCI
0
TMCI
1
Input External clock source for the counter
Timer reset input TMRI
0
TMRI
1
Input External reset signal for the counter
8.1.4 Register Configuration
Table 8.2 lists the registers of the 8-bit timer module. Each channel has an independent set of
registers.
Table 8.2 8-Bit Timer Registers
Address
Name Abbreviation R/W Initial Value TMR0 TMR1
Timer control register TCR R/W H'00 H'FFC8 H'FFD0
Timer control/status register TCSR R/(W)
*
H'10 H'FFC9 H'FFD1
Timer constant register A TCORA R/W H'FF H'FFCA H'FFD2
Timer constant register B TCORB R/W H'FF H'FFCB H'FFD3
Timer counter TCNT R/W H'00 H'FFCC H'FFD4
Serial/timer control register STCR R/W H'F8 H'FFD0 H'FFC3
Note: Software can write a “0” to clear bits 7 to 5, but cannot write a “1” in these bits.