TMP92CZ26A

92CZ26A-266

3.12 8 Bit Timer (TMRA)

The TMP92CZ26A features 8 channel (TMRA0 to TMRA7) built-in 8-bit timers.
These timers are paired into 4 modules: TMRA01, TMRA23, TMRA45 and TMRA67. Each
module consists of 2 channels and can operate in any of the fol lowing 4 opera ting modes.
• 8-bit interval timer mode
• 16-bit interval timer mode
• 8-bit programmable square wave pulse generation output mode (PPG: Variable duty cycle
with variable period)
• 8-bit pulse width modulation output mode (PWM – Variable duty cycle with constant
period)
Figure 3.12.1 to Figure 3.12.4 show bl ock diagrams for TMRA01 to TMRA67.
Each channel consists of an 8-bit up c ounter, an 8-bit com parator and an 8-bit timer regis ter.
In addition, a timer flip-flop and a prescaler are provided for each pair of channels.
The operation mode and timer flip-flops are controlled by 5bytes registers SFRs
(Special-function registers).
Each of the 4 modules (TMRA01 to TMRA67) can be operated independently. All modules
operate in the sam e ma nner; hence on ly the operati on o f T MRA01 is explained here.
The contents of this cha pter are as follows.
Table 3.12.1 Registers and Pins for Each Module
Module
Specification TMRA01 TMRA23 TMRA45 TMRA67
Input pin for external
clock
TA0IN
(Shared with PC1)
TA2IN
(Shared with PC3)
Low-frequency clock
fs
Low-frequency clock
fs
External
pin Output pin for timer
flip-flop
TA1OUT
(Shared with PM1)
TA3OUT
(Shared with PP1)
TA5OUT
(Shared with PP2)
TA7OUT
(Shared with PP3)
Timer run register TA01RUN (1100H) TA23RUN (1108H) TA45RUN (1110H) TA67RUN (1118H)
Timer register TA0REG (1102H)
TA1REG (1103H)
TA2REG (110AH)
TA3REG (110BH)
TA4REG (1112H)
TA5REG (1113H)
TA6REG (111AH)
TA7REG (111BH)
Timer mode register TA0 1M OD (1104H) TA 2 3 M O D ( 110CH ) TA 4 5 M O D (1114H ) TA 6 7 M O D (111CH )
SFR
(Address)
Timer flip-flop
control register TA1FFCR (1105H) TA3FFCR (110DH) TA5FFCR (1115H) TA7FFCR (111DH)