z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 91

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Table 47. Timer 0–1 High Byte Register (TxH)
Table 48. Timer 0–1 Low Byte Register (TxL)
Timer Control Register Definitions
BITS
FIELD
RESET
R/W
ADDR
BITS
FIELD
RESET
R/W
ADDR
PS026308-1207
Timer 0–1 High and Low Byte Registers
R/W
R/W
7
0
7
0
The timer input is used as a selectable counting source. It shares the same pin as the
complementary timer output. When selected by the GPIO alternate function registers, this
pin functions as a timer input in all modes except for the DUAL PWM OUTPUT mode.
For this mode, there is no timer input available.
The Timer 0–1 high and low byte (TxH and TxL) registers
contain the current 16-bit timer count value. When the timer is enabled, a read from TxH
causes the value in TxL to be stored in a temporary holding register. A read from TxL
always returns this temporary register content when the timer is enabled, however, when
the timer is disabled, a read from the TxL reads the TxL register content directly.
Writing to the timer high and low byte registers, while the timer is enabled is not
recommended. There are no temporary holding registers available for Write operations, so
simultaneous 16-bit writes are not possible. If either the timer high or low byte registers
are written during counting, the 8-bit written value is placed in the counter (high or low
byte) at the next clock edge. The counter continues counting from the new value.
TH and TL—Timer high and low bytes
These 2 bytes, {TH[7:0], TL[7:0]}, contain the current 16-bit timer count value.
R/W
R/W
6
0
6
0
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
F00H, F08H
F01H, F09H
TH
TL
R/W
R/W
3
0
3
0
R/W
R/W
Z8 Encore!
(Table 47
2
0
2
0
Product Specification
and
R/W
R/W
1
0
1
0
®
Table
F083A Series
48)
R/W
R/W
0
0
0
1
Timers
79