C509-L_97 Datasheet, PDF (152/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C509-L
6.3.6.3 Interrupt Flags of the Compare/Capture Unit
This section summarizes the CCU related compare match interrupt flags. The two compare timer
overflow interrupt flags (CT and CT1) are described in detail in section 6.3.2.1.
The compare timer match interrupt occurs on a compare match of the CM0 to CM7 registers with
the compare timer when compare mode 1 is selected for the corresponding channel. There are 8
compare match interrupt flags available in SFR IRCON1 which are or-ed together for a single
interrupt request. Thus, a compare match interrupt service routine has to check which compare
match has requested the compare match interrupt. The ICMPx flags must be cleared by software.
Only if timer 2 is assigned to the CMx registers (compare mode 0), an ICMPx request flag is set by
every match in the compare channel. When the compare timer is assigned to the CMx registers
(compare mode 1), an ICMPx request flag will not be set by a compare match event.
The compare timer 1 match interrupt occurs on a compare match of the CC10 to CC17 registers
with the compare timer 1. There are 8 compare match interrupt flags available in SFR IRCON2
which are or-ed together for a single interrupt request. Thus, a compare match interrupt service
routine has to check which compare match has requested the compare match interrupt. The ICC1x
flags must be cleared by software.
Special Function Register IRCON1 (Address D1H)
Special Function Register IRCON2 (Address BFH)
Reset Value : 00H
Reset Value : 00H
MSB
LSB
Bit No. 7
6
5
4
3
2
1
0
D1H ICMP7 ICMP6 ICMP5 ICMP4 ICMP3 ICMP2 ICMP1 ICMP0
IRCON1
7
6
5
4
3
2
1
0
BFH ICC17 ICC16 ICC15 ICC14 ICC13 ICC12 ICC11 ICC10 IRCON2
Bit
ICMP7 - 0
ICC17 - 10
Function
Compare timer match with register CM7 - CM0 interrupt flags
ICMPx is set by hardware when a compare match of the compare timer with the
compare register CMx occurs but only if the compare function for CMx has been
enabled. ICMPx must be cleared by software (CMSEL.x = 0 and CMEN.x = 1).
Compare timer 1 match with register CC17 - CC10 interrupt flags
ICC1x is set by hardware when a compare match of the compare timer 1 with the
compare register CC1x occurs but only if the compare function for CC1x has been
enabled. ICC1x must be cleared by software.
Semiconductor Group
6-74
1997-10-01