Z8F6421PM020SC Datasheet, PDF (105/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
85
taneous 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.
Timer 3 is unavailable in the 40- and 44-pin packages.
Table 38. Timer 0-3 High Byte Register (TxH)
BITS
7
6
5
4
3
2
1
0
FIELD
TH
RESET
0
R/W
ADDR
R/W
F00H, F08H, F10H, F18H
Table 39>. Timer 0-3 Low Byte Register (TxL)
BITS
7
6
5
4
3
2
1
0
FIELD
TL
RESET
0
1
R/W
R/W
ADDR
F01H, F09H, F11H, F19H
TH and TL—Timer High and Low Bytes
These 2 bytes, {TMRH[7:0], TMRL[7:0]}, contain the current 16-bit timer count value.
Timer Reload High and Low Byte Registers
The Timer 0-3 Reload High and Low Byte (TxRH and TxRL) registers (Tables 40 and 41)
store a 16-bit reload value, {TRH[7:0], TRL[7:0]}. Values written to the Timer Reload
High Byte register are stored in a temporary holding register. When a write to the Timer
Reload Low Byte register occurs, the temporary holding register value is written to the
Timer High Byte register. This operation allows simultaneous updates of the 16-bit Timer
Reload value.
In COMPARE mode, the Timer Reload High and Low Byte registers store the 16-bit
Compare value.
PS019915-1005
Timers