ST7232AK2-Auto STMicroelectronics, ST7232AK2-Auto Datasheet - Page 196
ST7232AK2-Auto
Manufacturer Part Number
ST7232AK2-Auto
Description
8-bit MCU for automotive, 16 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI
Manufacturer
STMicroelectronics
Datasheet
1.ST7232AK2-AUTO.pdf
(201 pages)
Specifications of ST7232AK2-Auto
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators and bypass for external clock
Four Power Saving Modes
halt, active halt, wait and slow
Main Clock Controller With
real time base, beep and clock-out capabilities
Two 16-bit Timers With
2 input captures, 2 output compares, PWM and pulse generator modes
- Current page: 196 of 201
- Download datasheet (4Mb)
Known limitations
15.1.3
15.1.4
Note:
196/201
Clearing the related interrupt mask does not generate an unwanted reset.
RIM ; reset the interrupt mask
LD A,sema ; check the semaphore status
CP A,#$01
jrne OUT
call call_routine ; call the interrupt routine
RIM
OUT:RIM
JP while_loop
.call_routine ; entry to call_routine
PUSH A
PUSH X
PUSH CC
.ext1_rt ; entry to interrupt routine
LD A,#$00
LD sema,A
IRET
Unexpected reset fetch
If an interrupt request occurs while a ‘POP CC’ instruction is executed, the interrupt
controller does not recognise the source of the interrupt and, by default, passes the reset
vector address to the CPU.
Workaround
To solve this issue, a ‘POP CC’ instruction must always be preceded by a ‘SIM’ instruction.
Clearing active interrupts outside interrupt routine
When an active interrupt request occurs at the same time as the related flag is being
cleared, an unwanted reset may occur.
Concurrent interrupt context
The symptom does not occur when the interrupts are handled normally, i.e. when:
●
●
●
If these conditions are not met, the symptom can be avoided by implementing the following
sequence:
Perform SIM and RIM operation before and after resetting an active interrupt request.
Example:
The interrupt flag is cleared within its own interrupt routine
The interrupt flag is cleared within any interrupt routine
The interrupt flag is cleared in any part of the code while this interrupt is disabled
SIM
Reset interrupt flag
RIM
ST7232Axx-Auto
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