ST92195C STMicroelectronics, ST92195C Datasheet - Page 85

• Manufacturer Part Number: ST92195C
• Description: 48-96 Kbyte Rom Hcmos Mcu With On-screen Display And Teletext Data Slicer
• Manufacturer: STMicroelectronics

ST92195C/D - STANDARD TIMER (STIM)
STANDARD TIMER (Cont’d)
7.2.5 Register Description
COUNTER HIGH BYTE REGISTER (STH)
R240 - Read/Write
Register Page: 11
Reset value: 1111 1111 (FFh)
Bits 7:0 = ST.[15:8]: Counter High-Byte.
COUNTER LOW BYTE REGISTER (STL)
R241 - Read/Write
Register Page: 11
Reset value: 1111 1111 (FFh)
Bits 7:0 = ST.[7:0]: Counter Low Byte.
Writing to the STH and STL registers allows the
user to enter the Standard Timer constant, while
reading it provides the counter’s current value.
Thus it is possible to read the counter on-the-fly.
STANDARD TIMER PRESCALER REGISTER
(STP)
R242 - Read/Write
Register Page: 11
Reset value: 1111 1111 (FFh)
Bits 7:0 = STP.[7:0]: Prescaler.
The Prescaler value for the Standard Timer is pro-
grammed into this register. When reading the STP
register, the returned value corresponds to the
programmed data instead of the current data.
00h: No prescaler
01h: Divide by 2
FFh: Divide by 256
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STP.7 STP.6 STP.5 STP.4 STP.3 STP.2 STP.1 STP.0
ST.15 ST.14 ST.13 ST.12 ST.11 ST.10 ST.9 ST.8
ST.7
7
7
7
ST.6
ST.5 ST.4
ST.3 ST.2
ST.1 ST.0
0
0
0
STANDARD
(STC)
R243 - Read/Write
Register Page: 11
Reset value: 0001 0100 (14h)
Bit 7 = ST-SP: Start-Stop Bit.
This bit is set and cleared by software.
0: Stop counting
1: Start counting
Bit 6 = S-C: Single-Continuous Mode Select.
This bit is set and cleared by software.
0: Continuous Mode
1: Single Mode
Bits 5:4 = INMD[1:2]: Input Mode Selection.
These bits select the Input functions as shown in
Section 7.2.2.2, Standard Timer Input Modes (ST9
devices with Standard Timer Input
enabled by INEN.
Bit 3 = INEN: Input Enable.
This bit is set and cleared by software. If neither
the STIN pin nor the CLOCK2 line are present,
INEN must be 0.
0: Input section disabled
1: Input section enabled
Bit 2 = INTS: Interrupt Selection.
0: Standard Timer interrupt enabled
1: Standard Timer interrupt is disabled and the ex-
Bits 1:0 = OUTMD[1:2]: Output Mode Selection.
These bits select the output functions as described
in
ST-SP S-C INMD1 INMD2 INEN INTS OUTMD1 OUTMD2
INMD1 INMD2 Mode
0
0
1
1
OUTMD1 OUTMD2 Mode
0
0
1
ternal interrupt pin is enabled.
7
Section 7.2.2.4, Standard Timer Output
0
1
0
1
0
1
x
TIMER
Event Counter mode
Gated input mode
Triggerable mode
Retriggerable mode
No output mode
Square wave output mode
PWM output mode
CONTROL
STIN), when
REGISTER
Modes.
0