ST62E32BF1 STMicroelectronics, ST62E32BF1 Datasheet - Page 55

• Manufacturer Part Number: ST62E32BF1
• Description: 8-bit Microcontrollers - MCU UV EPROM 8K SPI/UART
• Manufacturer: STMicroelectronics

Specifications of ST62E32BF1

• Product Category: 8-bit Microcontrollers - MCU
• Core: ST6
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 7948 B
• Data Ram Size: 192 B
• On-chip Adc: Yes
• Package / Case: SDIP-42
• Mounting Style: Through Hole
• A/d Bit Size: 8 bit
• A/d Channels Available: 21
• Data Rom Size: 128 B
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Programmable I/os: 30
• Number Of Timers: 1 x 8 bit
• Program Memory Type: EPROM
• Factory Pack Quantity: 13
• Supply Voltage - Max: 5 V
• Supply Voltage - Min: 4.5 V

CONTROL REGISTERS (Cont’d)
Status Control Register 4 (SCR4)
Address: E3h - Read/Write/Clear only
Bit7- Bit4 = Reserved, set to 0.
Bit 3 = OVFPOL. Overflow Output Polarity . This bit
defines the polarity for the Overflow Output OVF.
When 0, OVF is set on every overflow event if en-
abled in Set mode (OVFEN = 1, OVFMD = 0). The
reset state of OVF is 0.
When 1, OVF is reset on every overflow event if
enabled in Set mode.
The reset state of OVF is 1.
Bit 2 = OVFEN. Overflow Output Enable . This bit
enables the Overflow output OVF. When 0 the
Overflow output is disabled: if OVFPOL = 0, the
state of OVF is 0, if OVFPOL = 1, the state of
OVF = 1.The Overflow Output is enabled when
this bit = 1, it must be set to use the OVF output.
Bit 1 = PWMPOL. PWM Output Polarity. This bit
defines the polarity for the PWM Output PWM.
When 0, PWM is set on every Masked-Counter
Zero event and is reset on a Masked-Compare if
enabled in Set/Reset mode (PWMEN = 1, PWM-
MD = 0).
The reset state of PWM pin is 0 When 1, OVF is
set on every Masked-Compare event and is reset
on a Masked-Counter Zero event if enabled in
Set/Reset mode (PWMEN = 1, PWMMD = 0).
The reset state of PWM is 1.
Bit 0 = PWMEN. PWM Output Enable. This bit en-
ables the PWM output PWM. When 0 the PWM
output is disabled: if PWMPOL = 0, the state of
PWM is 0, if PWMPOL = 1, the state of PWM = 1.
The PWM Output is enabled when this bit = 1, it
must be set to use the PWM output.
Notes:
A Masked-Compare is the logical AND of the Mask
Register MASK with the Counter Register CT,
compared with the logical AND of the compare
Register CMP: [(MASK & CT) = (MASK&CMP)].
A Masked-Counter Zero is the logical AND of the
Mask Register MASK with the Counter Register
CT, compared with zero: [(MASK & CT) = 0000h].
Res. Res. Res. Res.
7
OVFP
OL
OVFE
N
PMPO
L
PWM
EN
0
4.3.6 16-BIT REGISTERS
Note: Care must be taken when using single-bit
instructions (RES/SET/INC/DEC) 16-bit registers
(RLCP, CP, CMP, MSK) since these instructions
imply a READ-MODIFY-WRITE operation on the
register. As the ST6 is based on a 8-bit architec-
ture, to write a 16-bit register, the high byte must
be written first to an intermediate register (latch
register) and the whole 16-bit register is loaded at
the same time as the low byte is written. A WRITE
operation of the HIGH byte is performed on the in-
termediate register (latch register) but a READ op-
eration of the HIGH byte is directly performed on
the 16-bit register (last loaded value). As a conse-
quence, it is always mandatory to write the LOW
byte before any single-bit instruction on the HIGH
byte in order to load the value set in the intermedi-
ate register to the 16-bit register (refresh the 16-bit
register).
Example:
The following sequence is NOT GOOD:
ldi t16cmph, 055h
ldi t16cmpl, 000h
ldi t16cmph, 0AAh
inc t16cmph
ldi t16cmpl, 000h
The CORRECT sequence is:
ldi t16cmph, 055h
ldi t16cmpl, 000h
ldi t16cmph, 0AAh
ldi t16cmpl, 000h
inc t16cmph
ldi t16cmpl, 000h
; t16cmp (16-bit register)=5500h
; t16cmp (16-bit register)=5500h
; t16cmp (16-bit register)=5500h
; t16cmp (16-bit register)=5600h
; and NOT AB00h
; t16cmp (16-bit register)=5500h
; t16cmp (16-bit register)=5500h
; t16cmp (16-bit register)=AA00h
; t16cmp (16-bit register)=AA00h
;t16cmp (16-bit register)=AB00h
ST62T32B ST62E32B
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