SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 77

• Manufacturer Part Number: SAB80C517-M16
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 7-20
Special Function Register TMOD (Address 89 H )
Timer/counter 0/1 mode control register
Bit
M1
Semiconductor Group
0
0
1
1
1
89 H
Gate
C/T
GATE
M0
0
1
0
1
1
Symbol
Gating control.
When set, timer/counter “x” is enabled only while “INTx” pin is high and
“TRx” control bit is set.
When cleared timer “x” is enabled whenever “TRx” control bit is set.
Counter or timer select bit.
Set for counter operation (input from “Tx” input pin).
Cleared for timer operation (input from internal system clock).
8-bit timer/counter
“THx” operates as 8-bit timer/counter
“TLx” serves as 5-bit prescaler.
16-bit timer/counter.
“THx” and “TLx” are cascaded; there is no prescaler.
8-bit auto-reload timer/counter.
“THx” holds a value which is to be reloaded into “TLx” each time it
overflows.
Timer 0:
TL0 is an 8-bit timer/counter controlled by the standard timer 0 control
bits. TH00 is an 8-bit timer only controlled by timer 1 control bits.
Timer 1:
Timer/counter 1 stops
C/T
Timer 1
M1
M0
78
GATE
On-Chip Peripheral Components
C/T
Timer 0
M1
M0
TMOD